Instruction Manual
™
LXD 75-Series Telescopes
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CONTENTS
Telescope Features ...................................................... 4
Autostar Features .......................................................... 9
Getting Started ..............................................................11
Unpacking and Assembly..........................................11
How to Assemble Your Telescope ............................11
Balancing the Telescope ..........................................13
Aligning the Viewfinder..............................................14
Choosing an Eyepiece..............................................14
Observing By Moving the Telescope Manually ........15
Activate the Arrow Keys............................................16
Slew Speeds ............................................................16
Observe the Moon ....................................................17
Tracking Objects ......................................................17
Setting the Polar Home Position ........................17
Observe a Star Using Automatic Tracking ..........18
Using Autostar's GO TO Capabilities ..................18
Moving Through Autostar’s Menus......................19
Initializing Autostar ..............................................19
Training the Drive ................................................20
Easy Alignment ........................................................21
Go To Saturn ............................................................21
Using the Guided Tour ..............................................22
Basic Autostar Operation................................................23
Autostar Navigation Exercise....................................23
Entering Data into Autostar ......................................24
Navigating Autostar ..................................................24
Autostar's Menus............................................................25
Object Menu..............................................................26
Event Menu ..............................................................27
Glossary Menu..........................................................27
Utilities Menu ............................................................27
Setup Menu ..............................................................28
Useful Autostar Features................................................32
Adding Observing Sites ............................................32
Using Autostar to Find Objects Not in the Libraries....33
Observing Satellites..................................................34
Landmarks ................................................................34
To Check on Available Memory ................................35
Photography ..................................................................36
Optional Accessories......................................................37
Maintenance and Collimation ........................................40
Specifications ................................................................46
Appendix A: Celestial Coordinates ................................50
Locating the Celestial Pole..................................51
One- And Two-Star Polar Alignment....................51
Appendix B: Enhancing Pointing Precision....................52
The Polar Alignment Viewfinder ..........................52
Three-Star Alignment Method #1 ........................52
Axis Alignment Method #2 ..................................53
Axis Alignment Method #3 ..................................55
Smart Drive Training (PEC) Method #4 ..............56
Appendix C: Latitude Chart ............................................57
Appendix D: EC Handbox ..............................................58
Appendix E: Mounting the Model SC-8 Optical Tube ....62
Appendix F: Basic Astronomy ........................................63
WARNING!
®
Never use a Meade
LXD75™-Series
Telescope to look at the Sun! Looking at or
near the Sun will cause instant and irre-
versible damage to your eye. Eye damage is
often painless, so there is no warning to the
observer that damage has occurred until it is
too late. Do not point the telescope or its
viewfinder at or near the Sun. Do not look
through the telescope or its viewfinder as it is
moving. Children should always have adult
supervision while observing.
CAUTION: Use care to install batteries in
the orientation indicated by the illustration in
the battery slots of the battery holder. Follow
battery manufacturer's precautions. Do not
install batteries backwards or mix new and
used batteries. Do not mix battery types. If
these precautions are not followed, batteries
may explode, catch fire, or leak. Improperly
installed batteries void your Meade warranty.
® The name "Meade," "Autostar" and the Meade logo are
trademarks registered with the U.S. Patent Office and in
principal countries throughout the world. "LXD75,"
"Autostar Suite," and “LPI” are trademarks of Meade
Instruments Corporation.
Patents:
US 6,304,376
US 6,392,799
US 6,563,636
D 422,610
Patent Pending
© 2004 Meade Instruments Corporation.
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TELESCOPE FEATURES
1$
J
e B
f d
I g
1#
H
C
1)
1!
1@
Fig. 1a: The LXD75-Series Telescope Optical Assembly (Schmidt-Newtonian model with Autostar handbox shown;
Electronic Controller model users, see Appendix D, page 58).
d
B 1^ g f e
C
3&
3^
3*
3%
3(
H
1%
I
Fig. 1c: The LXD75-Series Tripod.
Fig. 1b: Close up of Focuser and Viewfinder Assembly,
Schmidt-Newtonian shown. (See Fig. 1a for overview.) For
a close up of the refractor focuser assembly, see Fig. 10b,
page 13.
4
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1&
1*
3$
3@
3!
3)
2(
1(
ƿ
2*
2^
2$
2!
2@
2#
3#
2^
2&
2%
Fig. 1d: The LXD75-Series Mount; insert shows opposite side of Mount.
Ả
ấ
Ấ
ả
Ạ
ạ
Fig. 1e: The LXD75-Series Computer Control Panel (see 2$ above).
Legend
1. Eyepiece Thumbscrew
2. Eyepiece Holder
3. Eyepiece
4. Viewfinder (VF)
5. VF Collimation Screws
6. VF Front Cell
7. VF Bracket
21. Counterweight, Lock Knobs 31. R.A. Setting Circle
11. Cradle Assembly
12. Autostar Handbox
13. Cradle Ring Lock Knobs
14. Cradle Rings
15. VF Bracket Screws
16. Focus Lock Knob
17. Dec. Lock
22. Counterweight Shaft
23. Counterweight Safety Cap
24. Computer Control Panel
25. R.A. Motor Drive
32. R.A. Setting Circle Lock Knob
33. R.A. Lock
34. Dec. Motor Drive
35. T-Handle Lock and Shaft
26. Latitude Adjustment Handles 36. Spreader Bar
27. Azimuth Control Knobs
28. Latitude Dial
37. Tripod Mounting Base
38. Tripod Legs
8. Focus Knobs
18. Polar VF Cap
9. Corrector/Dust Cover
10. Optical Tube
29. Polar Alignment VF
30. Polar Alignment Reticle, LED
39. Spreader Tension Knob
19. Dec. Setting Circle
20. Counterweight Shaft Base
5
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LXD75-Series:Your Personal
Window to the Universe
The Meade LXD75-Series models are versatile, high-resolution telescopes. Supplied
with either an Electronic Controller or an Autostar handbox, the LXD75-Series models
offer unmatched mechanical and electronic performance.
Caution: Using products
other than standard Meade
accessories may cause
damage to the telescope’s
internal electronics and may
void the Meade warranty.
The LXD75-Series telescopes reveal nature in an ever-expanding level of detail.
Observe the feather structure of an eagle from 50 yards or study the rings of the plan-
et Saturn from a distance of 800 million miles. Focus beyond the Solar System and
observe majestic nebulae, ancient star clusters, and remote galaxies. Meade LXD75-
Series telescopes are instruments fully capable of growing with your interest and can
meet the requirements of the most demanding advanced observer.
Refer to Figures 1a through 1e for the following features:
B Eyepiece Thumbscrew: Tightens the eyepiece (see d) in place. Tighten to a
firm feel only.
C Eyepiece Holder: Holds eyepiece in place. Holders supplied for both 1.25" and
2" eyepieces.
d
Want to learn more
about the eyepieces
available for your
LXD75-Series
Diagonal (not shown, achromatic refractor and Schmidt-Cassegrain models
only): Provides a more comfortable right-angle viewing position. Slide the diagonal
directly into the eyepiece holder (see c) and tighten the thumbscrew on the eye-
piece holder to a firm feel only. See page 13 for a photo and more information.
telescope?
See OPTIONAL
ACCESSORIES, page
37.
D Eyepiece: Place the supplied Super Plössl 26mm eyepiece into the eyepiece
holder or the diagonal and tighten in place with the eyepiece thumbscrew (see
b). The eyepiece magnifies the image collected in the optical tube.
¿ 8 x 50mm (all models, except N-6EC Newtonian) or 6 x 30mm (N-6EC
Newtonian only) Viewfinder: A low-power, wide-field sighting scope with
crosshairs that enables easy centering of objects in the telescope eyepiece (see
d).
e
h
Want to learn more
about aligning the
viewfinder? See page
14.
´ Viewfinder Collimation Screws (6): Use these screws to adjust the alignment of
the viewfinder.
² Viewfinder Front Cell and Locking Ring: Adjust the front cell to focus the
viewfinder. See step 3, page 14 for more details. The viewfinder is supplied with
a small dust cover placed over the front cell.
Want to learn more
about attaching the
viewfinder? See page
12.
¶ Viewfinder Bracket: Holds the viewfinder in place.
º Focus Knobs: Moves the telescope’s focuser drawtube in a finely-controlled
motion to achieve precise image focus. The LXD75-Series telescopes can be
focused on objects from a distance of about 75 ft. to infinity. Rotate the focus
knobs to focus on objects.
¾ Corrector/Dust Cover: Place the dust cover (not visible in photo) over the cor-
rector when storing the telescope.
Note: The dust cover should be replaced after each observing session
and the power turned off to the telescope. Allow time for any dew that
might have collected during the observing session to evaporate prior to
replacing the dust cover.
1!
1@
Want to learn more
about assembling your
telescope?
See ASSEMBLING YOUR
TELESCOPE, page 11.
1) Optical Tube: The main optical component that gathers the light from distant
objects and brings this light to a focus for examination through the eyepiece.
1! Cradle Assembly: Attaches to mount base. See 1# and 1$.
EC Handbox users,
see Appendix D, page
62, for more informa-
tion.
1@ Autostar™: See pages 9 and 10 for a description of features.
1# Cradle Ring Lock Knobs (2) and Washers (2): Slide washers onto lock knobs
before inserting. Tighten to a firm feel to secure the optical tube in place.
1$ Cradle Rings (2): Part of the cradle assembly (see 1!); hold the optical tube firm-
ly in place.
6
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1% Viewfinder Bracket Screws: Tighten to a firm feel to hold viewfinder securely in
place (see E and h). See page 12 for more information.
1^ Focus Lock Knob: Designed to prevent the focuser drawtube from moving when
a heavy accessory, such as a camera, is attached to the focuser assembly. For
normal observing with an eyepiece and diagonal, it is not necessary to use the
lock knob.
Caution When loosening
the Dec. lock, be sure to
support the optical tube
(18, Fig. 1a). The weight of
the tube could cause the
tube to swing suddenly.
1& Declination (Dec.): Controls the manual movement of the telescope. Turning the
Dec. lock counterclockwise unlocks the telescope enabling it to be freely rotated
by hand about the Dec. axis. Turning the Dec. lock clockwise (to a firm feel only)
tightens the lock and prevents the telescope from being moved manually, but
engages the Dec. motor drive (see 3$) for Autostar operation.
1* PolarViewfinder Cap: Remove this cap when using the polar viewfinder (see 2().
1( Dec. Setting Circle: See APPENDIX A, page 50, for more information.
2) Counterweight Shaft Base: Thread, along with the shaft, to the mount. See
page 11 for more information.
2! Counterweight and Counterweight Lock Knob: Counterbalances the weight of
the optical tube, and adds stability to the mount. Tighten the lock knob on the side
of the counterweight to a firm feel to prevent the weight from sliding on the shaft.
2@ Counterweight Shaft: Slide the counterweight onto this shaft (see 2!).
2# Counterweight Safety Cap: Prevents the counterweight from accidentally slip-
ping off the end of the counterweight shaft.
2$ Computer Control Panel (see Fig. 1e):
A. Handbox (HBX) Port: Plug the Autostar or EC handbox coil cord (10,
Fig. 2) into this port.
B. 12v DC Power Connector: Plug the battery pack into this connector.
The telescope assembly also may be powered from either a 12v DC
auto cigarette lighter plug using the optional #607 Cigarette Lighter
Adapter or from a standard 115v AC home outlet using the optional
#547 Power Adapter with Cable or #547F Power Adapter for 220v out-
lets. See OPTIONAL ACCESSORIES, page 38.
C. LED: Illuminates when power is supplied to the Autostar or EC hand-
box and the telescope’s motor drive.
D. ON/OFF Switch: Turns the Computer Control Panel and Autostar ON
or OFF.
E. AUX Port: Provides connection for current and future Meade accessories.
See OPTIONAL ACCESSORIES, page 38.
F. Dec Port: Plug the coil cord from the Dec. motor assembly into this port
for Autostar to control the motor drive.
2% Right Ascension (R.A.) Motor Drive Assembly: Controlled by Autostar or EC
handbox. Moves the optical tube along the R.A. axis. The R.A. Lock (see 3#)
must be tightened to a firm feel in order for the R.A. motor to operate.
2^ Latitude AdjustmentT-Handles (2): Sets the latitude of your observing location.
The two T-handle screws work in a "push - pull" operation—as you tighten one,
loosen the other.
2& Fine Azimuth Control Knobs: Fine tune the side-to-side movement of the tele-
scope when centering Polaris in the telescope eyepiece or when using the polar
alignment viewfinder (see 2().
2*
Want to learn more
about setting the lati-
tude dials?
2* Latitude Dial: Set the latitude of the observing site on this dial using the latitude
T-handle screws. For more information see Step 6, page 12.
See STEP 6, page 12.
2( Polar Alignment Viewfinder: Allows you to precisely polar align the telescope.
Useful when performing astrophotography. See page 52.
3) Polar Alignment Viewfinder Reticle and LED Knob: Rotate the knob to switch
on or off the LED that illuminates the reticle within the polar alignment finder. Be 7
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sure to turn off the LED when finished with the polar viewfinder. Powered by (fac-
tory-supplied) batteries contained within.
2(
Want to learn more
about the polar align-
ment viewfinder?
3! R.A. Setting Circle: See APPENDIX A, page 50, for more information.
3@ R.A. Setting Circle Lock Knob: Rotate the knob to lock the R.A. Setting Circle
(see 3!) in place.
See the The Polar
Alignment Viewfinder,
page 52.
3# R.A. Lock: Controls the manual movement of the telescope. Turning the R.A.
lock counterclockwise unlocks the telescope enabling it to be freely rotated by
hand about the R.A. axis. Turning the R.A. lock clockwise (to a firm feel only)
tightens the lock and prevents the telescope from being moved manually, but
engages the R.A. motor drive (see 2%) for Autostar or EC handbox operation.
3$ Dec. Motor Drive Assembly: Controlled by Autostar or the EC handbox. Moves
the optical tube along the Dec. axis. The Dec. Lock (see 1&) must be tightened to
a firm feel in order for the Dec. motor to operate.
3% T-Handle Lock and Shaft: Place the spreader bar (see 3^) over the shaft and
thread the shaft into the tripod mounting base/mounting base (see 3&) and
tighten to a firm feel to secure the tray to the tripod and keep the tripod stable.
See HOW TO ASSEMBLE YOUR TELESCOPE, page 11 for more information.
4)
Fig. 1f: The tripod leg lock knob.
3^ Spreader Bar: Holds the tripod legs securely in place and also acts as a holder
for extra eyepieces.
3& Tripod Mounting Base: Set the telescope mount into the tripod mounting base
and secure into place using the T-handle lock and shaft. See HOW TO ASSEMBLE
YOUR TELESCOPE, page 11 for more information.
4!
3* Variable Height Tripod Legs (3): Supports the telescope mount. The mount
attaches to the top of the tripod.
3( Spreader Bar Tension Knob: Tighten to secure the spreader bar (see 3^)
against the tripod legs.
4) Tripod Leg Lock Knobs (one on each leg): Loosen these knobs to slide the
inner leg extension. Tighten the knobs to a firm feel to lock in the height of the
tripod.
4! Battery Pack and holder (see Fig. 1f): Plug into the 12v DC power connector
(B, Fig. 1e) of the computer control panel. Insert 8 (user-supplied) D-cell
batteries to power motor drives and Autostar handbox.
Fig. 1g: The LXD75-Series Battery
Pack and holder.
4!
Want to learn how to
install the batteries?
See step 12, page 13.
LXD75 TIPS
Caution: Use care to
install batteries as indicat-
ed by the battery com-
partment. Follow battery
manufacturer's precau-
tions. Do not install batter-
ies backwards or mix new
and used batteries. Do
not mix battery types. If
these precautions are not
followed, batteries may
explode, catch fire, or
leak. Improperly installed
batteries void your Meade
warranty. Always remove
the batteries if they are
not to be used for a long
period of time.
Join an Astronomy Club, Attend a Star Party
One of the best ways to increase your knowledge of astronomy is to join an astronomy
club. Check your local newspaper, school, library, or telescope dealer/store to find out if
there’s a club in your area.
At club meetings, you will meet other astronomy and Meade enthusiasts with whom you
will be able to share your discoveries. Clubs are an excellent way to learn more about
observing the sky, to find out where the best observing sites are, and to compare notes
about telescopes, eyepieces, filters, tripods, and so forth.
Often, club members are excellent astrophotographers. Not only will you be able to see
examples of their art, but you may even be able to pick up some “tricks of the trade” to
try out on your LXD75-Series telescope. See page 36 for more information about pho-
tography with the LXD75-Series.
Many groups also hold regularly scheduled Star Parties at which you can check out and
observe with many different telescopes and other pieces of astronomical equipment.
Magazines such as Sky & Telescope and Astronomy print schedules for many popular
Star Parties around the United States and Canada.
8
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AUTOSTAR FEATURES
¹
Important Note: The
model SN-6EC, model
SN-8EC, and model AR-
5EC are equipped with an
Electronic Controller
handbox, rather than the
Autostar Handbox.
Several of the following
procedures, such as
Tracking Objects and
Initializing Autostar (to
name but a few), are rele-
vant only to models
ᕡ
·
¿
´
»
º
²
equipped with the
Autostar handbox and do
not apply to the EC mod-
els. For more information
about the EC handbox,
see APPENDIX D: EC
HANDBOX, page 58.
¾
¶
µ
¸
Fig. 2: The Autostar Handbox.
Tour the Cosmos with Just the Push of a Button
Note: Autostar does not
require batteries; the tele-
scope’s batteries supply
power to Autostar.
Control of most LXD75-Series telescope models (excluding the EC models; see mar-
gin note) is through the operation of Autostar. Nearly all functions of the telescope are
accomplished with just a few pushes of Autostar’s buttons. Some of the major fea-
tures of Autostar are:
I
I
I
Automatic GO TO capability: Automatically move the telescope to any of the
more than 30,000 objects stored in the object library.
Take a guided tour of the best celestial objects to view on any given night of the
year.
Download the latest satellite data and software revisions directly from the Meade
I
I
Access a glossary of astronomical terms.
Fully automatic tracking of celestial objects.
Features
The Autostar Computer Controller provides control of virtually every telescope func-
tion within a compact handbox. Autostar has soft-touch keys designed to have a pos-
itive feel. The LCD (Liquid Crystal Display) is backlit with a red LED (Light Emitting
Diode) for easy viewing in the dark. The backlit display, key arrangement, and
sequential menu structure make Autostar extremely user friendly.
B 2-Line LCD Display: This screen displays Autostar's menus and other informa-
tion about the telescope.
I
I
Top line: Lists the primary menu.
Bottom line: Contains other menus that may be selected, menu options, tele-
scope status, or information about a function that is currently being performed.
C ENTER Key: Press to go to the next menu level or to choose an option in a
menu. The ENTER key is similar to the RETURN or ENTER key on a computer.
See MOVING THROUGH AUTOSTAR'S MENUS, page 19 and AUTOSTAR’S MENUS,
page 25.
9
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Note: If ENTER is pressed for two seconds or more and then released,
Autostar emits a beep and “ENTER to Sync” is displayed. "ENTER to
Sync" may be used only after your telescope has been aligned and is
pointing at an object. See page 30 for more details.
Tip:
If the "ENTER to Sync"
feature is accessed by
mistake, press MODE
to return to the previous
screen.
ᕣ MODE Key: Press to return to the previous menu level. The top menu level is
“Select Item." The MODE key is similar to the ESCAPE key on a computer.
Note: Pressing MODE repeatedly while in the “Select Item” level moves
Autostar to the topmost screen: “Select Item: Object.”
Note: If MODE is pressed and held for two seconds or more, information
about the telescope's status displays. When the status displays, press the
Scroll keys (7, Fig. 2) to display the following information and more:
I
Right Ascension and Declination (astronomical) coordinates
E
Want to learn more
about using the GO TO
function? See page
21.
I Altitude (vertical) and Azimuth (horizontal) coordinates
I Local Time and Local Sidereal Time (LST)
I Timer and Alarm Status
Press MODE again to return to the previous menu.
Want to learn how to
perform a spiral
search? See page 21.
E GO TO Key: Press to slew (move) the telescope to the coordinates of the cur-
rently selected object. While the telescope is slewing, the operation may be
aborted at any time by pressing any key except GO TO. Pressing GO TO again
resumes the slew to the object. Also, press GO TO after a slew is completed to
activate a "spiral search."
Definitions:
"Slew" means to move the
telescope's optical tube to
a selected object.
F Arrow Keys: Press to slew the telescope in a specific direction (up, down, left,
and right), at any one of nine different speeds. See SLEW SPEEDS, page 16.
G Number Keys: Press to input digits 0 to 9. When data is not being entered, the
Number keys can be used to change the slew speed. To operate, just press a
number key (1 is the slowest speed, 9 is the highest speed). Press the Number
key "0" to turn on and off the red utility light on the top of the handbox.
H Scroll Keys: Press to access options within a selected menu. The menu is dis-
played on the first line of the screen. Options in that menu are displayed, one at
a time, on the second line. Press the Scroll keys to move through the options.
Press and hold a Scroll key to move quickly through the options.
Fig. 3: Spread out the tripod legs.
(See next page.)
I ? Key: Press to access the "Help" function. Help provides on-screen information
on how to accomplish whatever task is currently active.
Hold down the ? key and then follow the prompts on the display to access details
of Autostar functions in the Help feature. The Help system is essentially an on-
screen instruction manual.
If you have a question about an Autostar operation, e.g., INITIALIZATION,
ALIGNMENT, etc., hold down the ? key and follow the directions that scroll on the
second line. When satisfied with the Help provided, press MODE to return to the
original screen and continue with the chosen procedure.
Thread shaft
through the
mounting base
Spreader
Braces
J Coil Cord Port: Plug one end of the Autostar coil cord (see 1)) into this port
located at the bottom of the Autostar handbox and the other end into the HBX
port of the computer control panel (A, Fig. 1e).
Bar
1) Coil Cord: Plug one end of the Autostar coil cord into the HBX port (A, Fig. 1e)
of the computer control panel of the telescope and the other end into the Autostar
coil cord port (See J).
Tension
Knob
1! RS232 Port: Plug in RS232 connections for downloading and connecting to com-
puter. Useful for downloading the latest satellite data and software revisions
AstroFinder™ Software and Cable Connector Kit. See OPTIONAL ACCESSORIES,
page 38.
T-Handle
Fig. 4: Thread T-handle shaft into
base. (See next page.)
1@ Utility Light: Use this built-in red light to illuminate star charts and accessories
without disturbing your eye's adaptation to darkness. Press "0" to turn the light
on and off.
10
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GETTING STARTED
As you unpack your telescope, carefully note the following parts. The assembly is
shipped in separate boxes.
Telescope Assembly
I
Equatorial mount with polar alignment finder
Heavy duty, adjustable aluminum tripod with leg braces, three tripod leg lock
knobs, and a captive mount locking knob
Second
slot
Bushing
I
I
Complete optical tube assembly including primary mirror with dust cover and a
rack-and-pinion focuser and eyepiece holders for both 1.25" and 2" eyepiece
holders, tube cradle assembly with two rings and two lock knobs
Super Plössl (SP) 26mm eyepiece
Counterweight and counterweight shaft. The 8" and 10" models include extra
counterweights.
I
I
Fig. 5a: Slide bushing over shaft.
I
8 x 50mm (all models, except N-6EC Newtonian) or 6 x 30mm (N-6EC
Newtonian only) viewfinder.
I
I
I
Factory-mounted dual electronic motor drive assembly
Autostar handbox, detachable coil cord, or Electronic Controller
Battery pack and holder
Second
slot
Accessories
I
Hex keys, T-Adapter (included with Schmidt-Newtonian models only)
E-clip
How to Assemble Your Telescope
The giftboxes contain the optical tube assembly and the tripod with the equatorial
mount. The accessories are located within compartments custom-cut into the styro-
foam block inserts.
Fig. 5b: Snap e-clip all the way onto
shaft above mount (shown partially
attached).
1. Remove the components from the giftboxes: Remove and identify the tele-
scope’s equipment. Refer to Figures 1a through 1f for images of the parts and
the overall assembly of your telescope. When removing the tripod from the gift-
box, hold the assembly parallel (horizontal) to the ground or the inner tripod leg
extensions will slide out as they are not locked in place.
2. Adjust the tripod legs. Spread the tripod legs as far as they will open. See Fig. 3.
3. Attach the spreader bar to the tripod with shaft: Thread the tension knob onto
the shaft (see Fig. 4). Place the spreader bar over the T-handle shaft. Slide the
bushing, the wide open side facing downward, onto the shaft as far as it will go
(Fig. 5a). Then slide the shaft up through the tripod mounting base (37, Fig. 1c).
Above the mount, snap the e-clip into the second, narrower precut slot (see Fig.
5a) of the shaft (Fig. 5b).
Fine
Azimuth
Control
Knobs
Place mount over
shaft with bushing
and c-clip.
Protrusion
4. Attach mount to tripod base: Place the mount over the tripod mounting base
(37, Fig. 1c) and onto the shaft, with the protrusion on top of the tripod's base
positioned between the fine azimuth control knobs (27, Fig. 1d). See Fig. 5c. If
necessary, back off the azimuth control knobs wide enough for protrusion to fit
between them.
Fig. 5c: Attach the mount to the
tripod.
Dec. Setting Circle
Tighten the T-handle to a firm feel. This attachment keeps the tripod and the tel-
escope mount securely in place. Then line up the spreader bar braces so that
they are each touching one of the tripods legs. Tighten the tension knob (39, Fig.
1c) to a firm feel. When you wish to collapse the tripod, loosen the tension knob
and move the braces off the legs. You do not need to remove the T-handle/shaft.
Shaft
Base
Counterweight
Lock
Knob
5. Attach the counterweight(s) to the counterweight shaft: Place the counter-
weight shaft base (20, Fig. 1d) over the threaded end of the shaft (22, Fig. 1d).
Thread the shaft and base assembly into the hole beneath the Dec. setting circle
as depicted in Fig. 6.
Shaft
Look through the hole in the counterweight and note the pin blocking the hole. Tilt
the counterweight slightly and the pin moves out of position, clearing the hole. If the
pin does not move, unscrew the counterweight lock knob slightly until the pin moves.
Safety
Cap
Unscrew the safety cap (23, Fig. 1d) from the shaft. Holding the counterweight
(21, Fig. 1d) firmly in one hand, slip the counterweight to approximately the mid-
point of the counterweight shaft (22, Fig. 1d). Tighten the counterweight lock
Fig. 6: Attach counterweight
assembly.
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knob to a firm feel. Replace the safety cap.
Note: If the counterweight ever slips, the safety cap (23, Fig. 1d) prevents
the counterweight from sliding entirely off the shaft. Always leave the
safety cap in place when the counterweight is on the shaft.
Secondary
Lock Knob
6. Set the latitude: Setting the latitude is easier if it is set before you attach the opti-
cal tube to the assembly. Locate the latitude dial (28, Fig. 1d); note that there is
a triangular pointer above the dial located on the mount. The pointer is not fixed;
it moves as the mount moves.
Cradle
Lock
Knob
Determine the latitude of your observing location. See APPENDIX C: LATITUDE
CHART, page 57, for a list of latitudes, or check an atlas. Move the latitude T-han-
dle screws in order to move the mount until the pointer points to your latitude. The
two T-handle screws work in a "push - pull" operation—as you tighten one, loosen
the other. When the pointer points at your latitude, tighten both screws until they
make contact with the mount.
Cradle Assembly Slot
Fig. 7: Attach cradle to base mount-
ing slot and tighten locking knobs.
At your observing site, set up the telescope assembly so that the tripod leg below
the Fine Azimuth Control Knobs (27, Fig. 1c) approximately faces North (or
South in the Southern Hemisphere). Model SC-8 users, see APPENDIX E, page
62.
Cradle Rings
7. Attach the cradle assembly to the mount: Remove the optical tube from the
cradle and slide the cradle assembly (11, Fig. 1a) onto the cradle mounting slot.
See Fig. 7. The rounded base of the cradle assembly fits into the rounded por-
tion of the mounting slot. Tighten both the cradle locking knob and the secondary
locking knob to a firm feel.
Lock
Knobs
Fig. 8: Place optical tube in rings
and loosely tighten cradle ring lock
knobs.
8. Position optical tube: Unscrew the cradle ring lock knobs (13, Fig. 1a) and open
the cradle rings. While firmly holding the optical tube (10, Fig. 1a), position it onto
the cradle rings (14, Fig. 1a) with the mid-point of the optical tube’s length lying
roughly in the center of the cradle ring assembly. Point the tube so that the front
end (this end comes shipped with the dust cover (9, Fig. 1a) over it) is oriented
as depicted in Fig. 1a. Then close the cradle rings (14, Fig. 1a) over the optical
tube. Loosely tighten the cradle ring lock knobs just to hold the tube securely in
place until you balance it. See BALANCING THE TELESCOPE, page 13.
Note: Model SC-8 users:
After completing step 6,
refer to APPENDIX E, page
62, step 1, for information
on how to attach the SC
optical tube to the mount.
9. Attach viewfinder bracket: Newtonian models (Fig. 9a): Locate the viewfinder
bracket screws (Fig. 9a) and remove the nuts from the screws. Slide the holes in
the viewfinder bracket over the viewfinder bracket screws. Replace the nuts and
tighten to a firm feel only.
Viewfinder
Mounting
Screws and
Nuts
Attach viewfinder tube: Back off the viewfinder collimation screws (5, Fig. 1b)
and slide the viewfinder tube into the bracket. Orient the viewfinder eyepiece as
depicted in Fig. 1b. Tighten the collimation screws to a firm feel. See ALIGNING
THE VIEWFINDER, page 14.
Attach viewfinder bracket: Achromatic refractor, Schmidt-Newtonian and
Schmidt-Cassegrain models (15, Fig. 1b and Fig. 9b ): Slide the track on the
bottom of the viewfinder bracket into the slot in the viewfinder mounting assem-
bly (which is already attached to the tube). To secure the viewfinder to the mount-
ing assembly, tighten the two thumbscrews to a firm feel only.
Fig. 9a: Viewfinder assembly,
Newtonian reflector models.
Attach viewfinder tube: Back off the viewfinder collimation screws (5, Fig. 1b)
and slide the viewfinder tube into the bracket. Point the viewfinder eyepiece
toward the focuser assembly. See Fig. 10b. Tighten the collimation screws to a
firm feel. See ALIGNING THE VIEWFINDER, page 14.
10. Insert the eyepiece: Schmidt-Newtonian and Newtonian models (Fig. 10a):
Lift to remove the dust cap from the eyepiece holder on the focuser assembly.
Set the dust cap aside in a safe place and replace it when you have finished
observing to protect the eyepiece assembly. Back off the eyepiece thumbscrews
(1, Fig. 1a) and insert the supplied SP 26mm eyepiece (3, Fig. 1a) into the the
eyepiece holder. Tighten the holder thumbscrews to a firm feel to secure the eye-
piece.
Fig. 9b: Viewfinder assembly, refrac-
tor and Schmidt-Newtonian and
Schmidt-Cassegrain models models.
Insert the eyepiece: Achromatic refractor and Schmidt-Cassegrain models
(Fig. 10b): Lift to remove the dust cap from the eyepiece holder on the focuser
assembly. Set the dust cap aside in a safe place and replace it when you have
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finished observing to protect the eyepiece assembly. Back off the eyepiece
thumbscrews (1, Fig. 1b) and slide the diagonal into the holder and tighten the
thumbscrews to a firm feel only. Insert the supplied SP 26mm eyepiece (3, Fig.
1b) into the the diagonal. Tighten the diagonal's thumbscrews to a firm feel to
secure the eyepiece.
Thumbscrew
Note: Two eyepiece holders are included with your telescope—for both
1.25" and 2" eyepieces.To change eyepiece holders, unscrew the attached
holder from the focuser and thread on the other holder.
Eyepiece
11. Adjust the height of the tripod: Adjust the height of the tripod by loosening the
tripod lock knobs (Fig. 11). Extend the sliding inner section of each tripod leg to
the desired length; then tighten each knob. Adjust the tripod to a height that is
comfortable for viewing.
Holder
Fig. 10a: Insert eyepiece into holder
and tighten thumbscrews.
12. Install Batteries: Insert eight (user-supplied) D-size batteries into the battery
holder, oriented as shown in the diagram on the battery slots of the holder. Plug
the battery pack into the 12v DC connector (B, Fig. 1e) on the computer control
panel. See Fig. 12.
Eyepiece
Thumbscrews
Caution: Use care to install batteries as indicated by the battery com-
partment. Follow battery manufacturer's precautions. Do not install bat-
teries backwards or mix new and used batteries. Do not mix battery types.
If these precautions are not followed, batteries may explode, catch fire, or
Holder
Diagonal
Ạ
ạ
Ả ả
Ấ
ấ
Fig. 10b: Insert eyepiece into
diagonal and tighten thumbscrews.
Fig. 13b: Reticle LED assembly: (A) Reticle Container; (B) LED;
(C) Batteries; (D) Battery Holder; (E) Threaded Lid; (F) Cap.
leak. Improperly installed batteries void your Meade warranty. Always
remove the batteries if they are not to be used for a long period of time.
Leg
Lock
Knob
Fig. 11: Adjust the tripod height
using the leg lock knobs.
13. Remove Plastic Strip from Reticle LED: The polar alignment reticle LED (30,
Fig. 1d) contains two watch batteries. The reticle's LED is shipped with a plastic
strip between the two batteries to protect battery life. Unthread both the cap (F)
and the threaded lid (E). Remove the plastic strip before using. Refer to the reti-
cle assembly in Fig. 13b and note the orientation of the batteries. Place the bat-
teries (C) into the battery holder (D) before inserting into the reticle container (A).
Fig. 12: Battery holder.
Note: Remember to turn off the LED when you are not using the reticle.
14. Plug in Autostar or EC Handbox: Plug the Autostar or EC handbox cable into
the HBX port (A, Fig. 1e).
Balancing the Telescope
In order for the telescope to be stable on the tripod and also for it to move smoothly,
it must be balanced. To balance the telescope, unlock the Right Ascension or R.A.
lock (33, Fig. 1d). When this axis is unlocked, the telescope pivots on the R.A. axis.
Later in the procedure, you will also unlock the Declination or Dec. lock (17, Fig. 1d).
When unlocked, the telescope pivots on the Dec. axis. Most of the motion of the tel-
escope takes place by moving about these two axes, separately or simultaneously.
Try to become familiar with these locks and observe how the telescope moves on
each axis. To obtain a fine balance of the telescope, follow the method below:
Reticle LED
Fig. 13: Reticle assembly.
1. Firmly hold the optical tube secure so that it cannot accidentally swing freely.
Loosen the R.A. lock (33, Fig. 1d). The optical tube now moves freely about the
R.A. axis. Rotate the telescope so that the counterweight shaft (22, Fig. 1d) is 13
parallel (horizontal) to the ground.
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3. Achromatic refractor, Schmidt-Newtonian models and Newtonian models:
Again, hold the optical tube so that it cannot accidentally swing freely. Lock the
R.A. lock (33, Fig. 1d), and unlock the Dec. lock (17, Fig. 1d). The telescope now
is able to move freely about the Dec. axis. Loosen the cradle ring lock knobs (13,
Fig. 1a) so that the main tube slides easily back and forth in the cradle rings.
Move the main tube in the cradle rings until the telescope remains in one posi-
tion without tending to drift down in either direction. Re-lock the Dec. lock (17,
Fig. 1d).
Collimation Screws
Viewfinder
Eyepiece
Viewfinder
Bracket
The telescope is now properly balanced on both axes. Next, the viewfinder must be
aligned.
Aligning the Viewfinder
Fig. 14a: Viewfinder assembly,
refractor and Schmidt-Newtonian mod-
The wide field of view of the telescope's viewfinder (4, Fig. 1a) provides an easier way
to initially sight objects than the main telescope's eyepiece (3, Fig. 1a), which has a
much narrower field of view. If you have not already attached the viewfinder to the tel-
escope tube assembly, follow the procedure described in step 9, page 12.
Viewfinder
Eyepiece
Collimation Screws
In order for the viewfinder to be useful, it must be aligned to the main telescope, so
that both the viewfinder and telescope's optical tube (10, Fig. 1a) point at the same
position in the sky. This alignment makes it easier to find objects: First locate an
object in the wide-field viewfinder, then look into the eyepiece of the main telescope
for a detailed view.
To align the viewfinder, perform steps 1 through 4 during the daytime; perform step 5
at night. Both the 6 x 30mm and the 8 x 50mm viewfinders align in an identical man-
ner. Refer to Figs. 14a and 14b.
Viewfinder
Bracket
Fig. 14b: Viewfinder assembly,
Newtonian models.
1. Remove the dust covers from the optical tube (9, Fig. 1a) and the viewfinder.
2. If you have not already done so, insert the low-power SP 26mm eyepiece (3, Fig.
1b) into the eyepiece holder of the main telescope. See step 10, page 12.
Important Note: Objects
appear upside-down and
reversed left-for-right when
observed in the viewfinder.
With refracting telescope
models, objects viewed
3. Look through the viewfinder eyepiece at an object at least one-half mile away
(Tip: Remove the viewfinder tube from the bracket to simplify this operation). If
the distant object is not in focus, turn the focus lock ring counterclockwise to
loosen the viewfinder front cell (6, Fig. 1b). Twist the front cell until focus is
achieved and retighten the focus lock ring.
through the main telescope
with the diagonal mirror in
place are seen right-side-up,
but reversed left-for-right.
4. Unlock the R.A. lock (33, Fig. 1d) and the Dec lock (17, Fig. 1d) so that the tel-
escope turns freely on both axes. Then point the main telescope at a tall, well-
defined and stationary land object (e.g., the top of a telephone pole) at least 200
yards distant and center the object in the telescope's eyepiece. Focus the image
by turning the focus knobs (8, Fig. 1b). Retighten the R.A. and Dec. locks.
This image inversion is of no
consequence when observ-
ing astronomical objects,
and in fact all astronomical
telescopes yield inverted
images.
5. Look through the viewfinder and loosen or tighten, as appropriate, one or more
of the viewfinder collimation thumbscrews (5, Fig. 1b) until the viewfinder’s
crosshairs are precisely centered on the object you previously centered in the
main telescope's eyepiece. You are now ready to make your first observations
with your telescope.
During terrestrial observing,
where a fully-correctly-orient-
ed image (right-side up and
correct left-for-right) is desir-
able, an optional Meade
#928 45° Erect-Image
NEVER point the telescope directly at or near the Sun at any time!
Observing the Sun, even for the smallest fraction of a second, will
result in instant and irreversible eye damage, as well as physical
damage to the telescope itself.
Diagonal Prism is available.
See OPTIONAL ACCES-
SORIES, page 38.
5. Check this alignment on a celestial object, such as a bright star or the Moon, and
make any necessary refinements, using the method outlined above in steps 3 and
4.
Note that for Schmidt-
Newtonian models, no
With this alignment performed, objects first located in the wide-field viewfinder will
also appear in the telescope's eyepiece.
means of image inversion is
available; while these tele-
scopes may be used for ter-
restrial observing, the image
will not be correctly oriented
in either right-side-up or left-
for-right orientations.
Choosing an Eyepiece
A telescope’s eyepiece magnifies the image formed by the telescope’s main optics.
Each eyepiece has a focal length, expressed in millimeters, or “mm.” The smaller the
focal length, the higher the magnification. For example, an eyepiece with a focal length
of 9mm has a higher magnification than an eyepiece with a focal length of 26mm.
Your telescope comes supplied with a Super Plössl (SP) 26mm eyepiece which gives
a wide, comfortable field of view with high image resolution.
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Low power eyepieces offer a wide field of view, bright, high-contrast images, and eye
relief during long observing sessions. To find an object with a telescope, always start
with a lower power eyepiece such as the Super Plössl 26mm. When the object is
located and centered in the eyepiece, you may wish to switch to a higher power eye-
piece to enlarge the image as much as practical for prevailing seeing conditions. For
information about optional eyepieces for the LXD75-Series models, see OPTIONAL
ACCESSORIES, page 37.
Note: Seeing conditions
vary widely from night-to-
night and site-to-site.
Turbulence in the air, even
on an apparently clear
night, can distort images. If
an image appears fuzzy
and ill-defined, back off to a
lower power eyepiece for a
more well-resolved image
(see Fig. 15a and 15b
below).
The power, or magnification of a telescope is determined by the focal length of the tel-
escope and the focal length of the eyepiece being used. To calculate eyepiece power,
divide the telescope's focal length by the eyepiece's focal length. For example, a
26mm eyepiece is supplied with the LXD75-Series. The focal length of the 8" LXD75-
Series model is 812mm (see SPECIFICATIONS, page 46).
Telescope Focal Length ÷ Eyepiece Focal Length = Magnification (Power)
Telescope Focal Length = 812mm
Note: For a list of magnifi-
cation ratings of the eye-
pieces available for the
LXD75-Series telescopes,
see OPTIONAL ACCES-
SORIES, page 37.
Eyepiece Focal Length
812 ÷ 26
= 26mm
= 31
The eyepiece power, or magnification is therefore 31X (approximately).
Observing by Moving the Telescope Manually
After the telescope is assembled and balanced as described previously, you are ready
to begin manual observations. View easy-to-find terrestrial objects such as street
signs or traffic lights to become accustomed to the functions and operations of the tel-
escope. For the best results during observations, follow the suggestions below:
I
When you wish to locate an object to observe, first loosen the telescope’s R.A.
lock (33, Fig. 1d) and Dec. lock (17, Fig. 1d). The telescope can now turn freely
on its axes. Unlock each axis separately and practice moving your telescope.
Then practice with two unlocked axes at the same time. It is very important to
practice this step to understand how your telescope moves, as the movement
of an equatorial mount is not intuitive.
I
I
Use the aligned viewfinder to sight-in on the object you wish to observe. When the
object is centered in the viewfinder’s crosshairs, re-tighten the R.A. and Dec. locks.
A telescope’s eyepiece magnifies the image formed by the telescope’s main
optics. Each eyepiece has a focal length, expressed in millimeters, or “mm.” The
smaller the focal length, the higher the magnification. For example, an eyepiece
with a focal length of 9mm has a higher magnification than an eyepiece with a
focal length of 26mm.
Low-power magnification eyepieces offer a wide field of view, bright, high-contrast
images, and relief of eye strain during long observing sessions. To observe an object
with a telescope, always start with a low power eyepiece such as the SP 26mm
LXD75 TIPS
Too Much Power?
Can you ever have too much power? If the type of power you’re referring to is
eyepiece magnification, yes, you can! The most common mistake of the begin-
ning observer is to “overpower” a telescope by using high magnifications which
the telescope’s aperture and atmospheric conditions cannot reasonably support.
Keep in mind that a smaller, but bright and well-resolved image is far superior to
one that is larger, but dim and poorly resolved (see Figs. 15a and 15b). Powers
above 400X should be employed only under the steadiest atmospheric condi-
tions.
Fig. 15a & 15b: Jupiter; examples of
the right amount of magnification and
too much magnification.
Autostar can calculate the best eyepiece for you to use. Try out the “Eyepiece
Calc” feature in the Utilities menu.
Most observers should have three or four additional eyepieces to achieve the full
range of reasonable magnifications possible with the LXD75-Series telescopes.
See OPTIONAL ACCESSORIES, page 37.
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supplied with your telescope. When the object is centered and focused in the eye-
piece, switch to a higher power eyepiece to enlarge the image as much as practi-
cal for prevailing viewing conditions. For information about other eyepieces avail-
able for your telescope, see OPTIONAL ACCESSORIES, page 37.
I
Once centered, an object can be focused by turning one of the knobs of the
focusing mechanism (8, Fig. 1b). Notice that when observing astronomical
objects, the field of view begins to slowly drift across the eyepiece field. This
motion is caused by the rotation of the Earth on its axis. Objects appear to move
through the field more rapidly at higher powers. See TRACKING OBJECTS, page
17, for detailed information on how you can counteract the drift in the field of view.
Activate the Arrow Keys (Autostar Models Only)
Autostar's Arrow keys allow you to slew (move) the telescope up, down, right, or left.
The following procedure describes how to activate Autostar's Arrow keys:
Note: Autostar only
prompts you to enter
Country (or State) and
City as described in steps
3, 4, and 5, the first time it
is activated. These
prompts do not appear
again, unless you reset
Autostar (see RESET,
page 31).
1. After the batteries are installed and Autostar's cord is plugged into the HBX port
of computer control panel (A, Fig 1e), a copyright message lights on the Autostar
LCD display (1, Fig. 2).
2. A message warning not to look at the Sun scrolls across the display. Press the
key prompted by Autostar to acknowledge that the Sun warning has been read
and understood.
3. Press ENTER (2, Fig. 2) repeatedly until "Country/State" appears on the display.
(Ignore the prompts requesting Date and Time. See INITIALIZING AUTOSTAR,
page 19, for more information).
However, if you need to
re-enter this information
(e.g., you change your
geographic location), you
can change the location
information by using the
Site option of the Setup
menu. See ADDING
4. Use the Scroll keys (7, Fig. 2) to cycle through the database of countries, states,
and provinces. Press ENTER when the correct location displays.
5. Autostar then prompts you to enter the nearest city (listed alphabetically) to the
observing site. Use the Scroll keys to cycle through the database of cities. Press
ENTER when the correct city appears on the display.
6. Autostar then prompts you to enter the model number of your telescope. Use the
Scroll keys to cycle through the list of telescope models. Press ENTER when the
correct model appears on the display.
OBSERVING SITES, page
32, for detailed informa-
tion.
7. The display then reads "Align: Easy." You now can use Autostar's Arrow keys to
move the telescope to observe.
Note: If you go past the "Align: Easy" (or any other menu display you wish
to select), press MODE to return to the previous display(s).
8. Press the Arrow keys (5, Fig. 2) to move the telescope up, down, right, or left.
You can move the telescope at different speeds.
Slew Speeds (Autostar Models Only)
Autostar has nine slew speeds that move the optical tube at rates that are directly pro-
portional to the sidereal rate and have been calculated to accomplish specific func-
tions. Press a Number key (6, Fig. 2) to change the slew speed, which is shown for
about two seconds on Autostar’s display.
The nine available speeds are:
Number Key 1 =
Number Key 2 =
Number Key 3 =
Number Key 4 = 16x =
Number Key 5 = 64x =
Number Key 6 = 128x =
Number Key 7 = 1.5° =
Guide (0.25 arc-min/sec or 0.004°/sec)
2 x sidereal (0.5 arc-min/sec or 0.008°/sec)
8 x sidereal (2 arc-min/sec or 0.033°/sec)
16 x sidereal (4 arc-min/sec or 0.067°/sec)
64 x sidereal (16 arc-min/sec or 0.27°/sec)
30 arc-min/sec or 0.5°/sec
2x =
8x =
90 arc-min/sec or 1.5°/sec
Number Key 8 =
3° = 180 arc-min/sec or 3°/sec
Number Key 9 = Max = 270 arc-min/sec or 4.5°/sec
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Speeds 1, 2, or 3: Best used for fine centering of an object in the field of view of a
higher power eyepiece, such as a 12mm or a 9mm eyepiece.
Speeds 4, 5, or 6: Enables centering an object in the field of a low-to-moderate power
eyepiece, such as the standard Super Plössl 26mm.
Speeds 7 or 8: Best used for rough centering of an object in the viewfinder.
Note: If you wish to per-
form a more precise
polar alignment for the
purposes of astrophotog-
raphy, see "Appendix B,"
page 52.
Speed 9: Moves the telescope quickly from one point in the sky to another.
Observe the Moon
Point your telescope at the Moon (note that the Moon is not visible every night). Use
your EC handbox or Autostar to practice using the Arrow keys and the slew speeds to
view different features. The Moon contains many interesting features, including
craters, mountain ranges, and fault lines. The best time to view the Moon is during its
crescent or half phase. Sunlight strikes the Moon at an angle during these periods and
adds a depth to the view. No shadows are seen during a full Moon, making the over-
ly bright surface to appear flat and rather uninteresting. Consider the use of a neutral
density Moon filter when observing the Moon. See OPTIONAL ACCESSORIES, page
38. Not only does it cut down the Moon's bright glare, but it also enhances contrast,
providing a more dramatic image.
Point optical
tube to North
North
Point
counterweight
shaft straight
down over
mount.
Tracking Objects
As the Earth rotates beneath the night sky, the stars appear to move from East to
West. The speed at which the stars move is called the sidereal rate. You can setup
your telescope to move at the sidereal rate so that it automatically tracks the stars and
other objects in the night sky. The tracking function automatically keeps an object
more or less centered in the telescope’s eyepiece.
Level
Mount
Fine
To automatically track objects, you first need to learn how to set the polar home position
of your telescope and then how to select "Targets: Astronomical" from the Autostar
Setup menu. EC handbox users, see APPENDIX D, page 58, for more information.
Azimuth
Control
Knobs
Setting the Polar Home Position
1. Level the mount, if necessary, by adjusting the length of the three tripod legs.
Fig. 16a: The polar home position,
side view. Inset: Line up triangles on
the mount.
2. Unlock the R.A. Lock (33, Fig. 1d). Rotate the Optical Tube Assembly until the
counterweight shaft is pointing straight down over the mount. See Figs. 16a and
16b.
3. If you have not already done so, lift the telescope assembly and turn it so the
tripod leg below the Fine Azimuth Control Knobs (27, Fig. 1c) approximately
faces North (or South in the Southern Hemisphere). Release the Dec. lock (17,
Fig. 1d) of the tripod, so that the optical tube (10, Fig. 1a) may be rotated. Rotate
the optical tube until it points North (or South in the Southern Hemisphere). Then
re-tighten the lock. Locate Polaris, the North Star, if necessary, to use as an
accurate reference for due North (or Sigma Octantis in the Southern
Hemisphere). See LOCATING THE CELESTIAL POLE, page 51.
4. If you have not already done so, determine the latitude of your observing location.
See APPENDIX C: LATITUDE CHART, page 57, for a list of latitudes of major cities
around the world. Use the latitude T-handle screws (26, Fig. 1d) to tilt the tele-
scope mount so that the pointer indicates the correct latitude of your viewing loca-
tion on the latitude dial (28, Fig. 1d). See step 6, page 12 for more information.
5. If steps 1 through 4 above were performed with reasonable accuracy, your tele-
scope is now sufficiently well-aligned to Polaris, the North Star, for you to begin
making observations.
Once the mount has been placed in the polar home position as described above, the
latitude angle need not be adjusted again, unless you move to a different geographi-
cal location (i.e., a different latitude).
Important Note: For almost all astronomical observing requirements,
approximate settings of the telescope’s latitude and other settings are
acceptable. Do not allow undue attention to precise settings of polar home
position of the telescope to interfere with your basic enjoyment of the
instrument.
Fig. 16a: The polar home position,
front view.
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Observe a Star using the Automatic Tracking Feature
In this example, Autostar's Arrow keys are used to find a star, and then Autostar's
tracking capability automatically keeps the star centered in your telescope's eyepiece.
EC handbox users, see APPENDIX D, page 58, for information about tracking with the
EC handbox.
Tip:
You can change the tele-
scope's slew rate while
centering an object in the
eyepiece. See SLEW
SPEEDS, page 16 for
more information.
1. If you have activated the Arrow keys and completed setting the telescope in the
polar home position, Autostar's display now reads "Align: Easy." Go to Step 2.
If you have not used Autostar yet or have just plugged it into the HBX port, per-
form the procedures described in ACTIVATETHE ARROW KEYS, page 16 and SET-
TING THE POLAR HOME POSITION, page 17. Then go to Step 2 of this procedure.
If you have been using Autostar to perform other functions and the display does
not read "Align: Easy," follow these steps:
a. Press MODE (3, Fig. 2) repeatedly until "Select Item: Object" displays.
b. Press the Scroll Up key (7, Fig. 2) once. "Select Item: Setup" displays.
c. Press ENTER (2, Fig. 2). "Setup: Align" displays. Go to Step 3.
Important Note: While
performing the automatic
tracking procedure, you
may use the Arrow keys
to move the telescope or
you may also loosen the
telescope locks (17 and
33, Fig. 1d) and move
the optical tube manually
to locate another object
in the sky. The tracking
function will continue to
be operational and the
telescope will track the
new object.
2. Press MODE (3, Fig. 2). "Setup: Align" displays.
3. Press the Scroll Down key repeatedly until "Setup: Targets" displays. Press
ENTER (2, Fig. 2).
4. "Targets: Terrestrial" displays. Press one of the Scroll keys once (7, Fig. 2).
"Targets: Astronomical" now displays.
5. Use the Arrow keys (5, Fig. 2) to locate a bright star in the night sky. Use the
viewfinder to help line up on the star. You may choose any unobstructed, bright
star for the purposes of this example. Use Autostar's Arrow keys to center the star
in the eyepiece. Once the star is centered, press ENTER to select
"Astronomical." The telescope's tracking motors then engage. It may take the
tracking motors several seconds to begin tracking. When they do, it may be nec-
essary to once again center the star in the eyepiece. The tracking motors will
then keep any star you choose in the center of the eyepiece.
6. Press and hold the ENTER key for a few seconds and then release to stop track-
ing. You may also stop tracking by choosing "Terrestrial" in the Targets menu.
Using Autostar's GOTO Capabilities (Autostar Models Only)
Before you can use Autostar's GO TO capabilities, you must first:
•
•
•
Learn how Autostar's keys move through the menus
Initialize Autostar
Place the telescope in the polar home position, if you have not already done so
(see SETTING THE POLAR HOME POSITION, page 17)
•
Select "Align: Easy" from Autostar's menus
LXD75 TIPS
Which One’s the Alignment Star?
If Autostar has chosen an alignment star with which you are unfamiliar, how can
you be sure if the star in your eyepiece is really the alignment star?
The rule of thumb is that an alignment star is usually the brightest star in that
area of the sky. If you perform a GO TO to an alignment star and you're not sure
if you have located the alignment star or it isn't in the eyepiece, look through your
viewfinder. When you view an alignment star in the viewfinder, it stands out dra-
matically from the rest of the stars in that portion of the sky. The viewfinder will
help you locate a star more quickly than the eyepiece, because it has a much
wider field of view than the eyepiece. Using Autostar, set the slew speed to 6 or
higher and use the Arrow keys to center the alignment star in the viewfinder. If
your viewfinder has been aligned with the telescope, the alignment star should
now be in the eyepiece. Set the slew speed to 4 or less and center the star in
the eyepiece. Also see the "Spiral Search" tip on page 21.
If you have an obstruction, such as a tree or a building blocking your view of the
alignment star, or if you have any doubts at all about the star that has been cho-
sen, no problem. Just press the Scroll Down key and Autostar will find another
star to align upon.
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Moving Through Autostar’s Menus (Autostar Models Only)
Autostar's menus are organized for quick and easy navigation.
Tip:
I
I
I
Press ENTER (2, Fig. 2) to go deeper into Autostar menu levels.
Press MODE (3, Fig. 2) to move back toward the top menu level.
Press the Scroll keys (7, Fig. 2) to move up and down through the options avail-
able for each menu level.
Press the Arrow keys (5, Fig. 2) to enter characters.
Press the Number keys (6, Fig. 2) to enter digits.
When multiple choices are
available within a menu
option, the current option is
usually displayed first and
highlighted by a right point-
ing arrow (>).
I
I
Initializing Autostar (Autostar Models Only)
This exercise describes how to initialize Autostar.
Note: Normally, you will enter the Time and Date at the beginning of each
observing session, but you will only perform the full Initialization proce-
dure (i.e., entering the Location information and selecting the model num-
ber as well as entering the Time and Date) the first time you use Autostar
or after performing a Reset.
Definition:
Initialization is a proce-
dure that ensures that
Autostar operates correctly.
When you first use
Autostar, it doesn't yet
know where the observa-
tion location site is or the
time or date of the obser-
vation session.
1. Make sure that the telescope is assembled correctly, and that the batteries are
installed as described previously.
2. Make sure the On/Off switch (D, Fig. 1e) is in the Off position. Plug Autostar's
cord into the HBX port (A, Fig. 1e), as previously described. Push the On/Off
switch to the On position.
3. A copyright message lights on Autostar’s LCD display and a message warning
not to look at the Sun scrolls across the display. Press the key prompted by
Autostar to acknowledge the message has been read and understood.
You will enter information,
such as the current time
and date, and observation
location.
Autostar uses this informa-
tion to precisely calculate
the location of celestial
objects (such as stars and
planets) and to automati-
cally move your telescope
correctly for various opera-
tions.
4. The Getting Started menu displays a scrolling message with two choices:
a. Press and hold down the ? key (8, Fig. 2) for about 2 seconds for informa-
tion on Autostar functions and controls. When finished, press MODE (3, Fig.
2) to exit Help, or,
b. Press ENTER (2, Fig. 2) to bypass the Help tutorial and continue with
Initialization.
5. Autostar prompts you to enter the current date:
a. Press the Numbers keys (6, Fig. 2) to enter numbers 0 through 9. After the
desired number is displayed, use the Right Arrow key (5, Fig. 2) to move the
cursor from one number to the next in the day display (or use the Left Arrow
key to move in the other direction across the display, if necessary).
b. Use the Right Arrow key (5, Fig. 2) to move the cursor to the month. Use the
Scroll keys (7, Fig. 2) to cycle through the list of months. When the current
month is displayed, use the Right Arrow (5, Fig. 2) to move the cursor to the
year.
c. Use Number keys (6, Fig. 2) to enter all four digits of the current year. Use
the Right Arrow key (5, Fig. 2) to move the cursor from one number to the
next.
d. Press ENTER (2, Fig. 2) when the entire date has been entered.
6. Autostar then prompts you to enter the current time. Use the Number keys to
enter digits. The Right and Left Arrow keys move the cursor across the screen
as described in the previous step. Enter the current time (use a "0" for the first
digit if less than 10). Use the Up Arrow key (7, Fig. 2) to scroll through "AM,"
"PM,'" or "blank." The "blank" option (screen displays neither AM nor PM) selects
the 24-hour (i.e., military time) clock. Then press ENTER to start the clock.
7. Autostar then prompts you to enter the status of Daylight Savings Time. Press
one of the Scroll keys to toggle between the YES/NO settings. Select the desired
setting by pressing ENTER.
Note: Daylight Savings Time may be referred to by a different name in
various areas of the world.
8. If you have previously entered the Country/State and City of your observing site
(as described in ACTIVATE THE ARROW KEYS, page 16), go to step 9. If you have
not entered this information, perform the following steps:
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a. Autostar prompts you to enter the Country or State (listed alphabetically) of
the observing site. Use the Scroll keys to cycle through the database of
countries, states, and provinces. Press ENTER when the correct location
displays.
b. Autostar then prompts you to enter the nearest city (listed alphabetically) to
the observing site. Use the Scroll keys to cycle through the database of
cities. Press ENTER when the correct city appears on screen.
9. Autostar then prompts you to enter the model number of your telescope. Use the
Scroll keys to cycle through the list of telescope models. Press ENTER when the
correct model appears on the display.
Note: Autostar only prompts you to enter Country/State and City and
model number the first time it is activated. These prompts do not appear
again, unless you reset Autostar (see RESET, page 31). However, if you
need to enter this information (e.g., you change your geographic location),
you can do so by using the Site option of the Setup menu. See ADDING
OBSERVING SITES, page 32, for detailed information.
10. System Initialization is complete and the display reads "Align: Easy." After per-
forming the Initialization procedure, you MUST train your drive.
Training the Drive (Autostar Models Only)
Next, train the drive using Autostar. Perform this procedure the first time you use
Autostar with your telescope, after a Reset, or if you are experiencing any pointing
accuracy problems. Training the drive gives your telescope a higher degree of point-
ing accuracy.
Note: Use a terrestrial object, such as a telephone pole or lamp post, to
train the drive. It is best to perform this procedure during the daytime.
1. If you have just performed INITIALIZING AUTOSTAR, go to step 2.
If you have not yet initialized Autostar, go to page 19 and follow the procedure
described in INITIALIZING AUTOSTAR.Then go to step 2 of this procedure.
2. Keep pressing MODE until "Select Item: Object" displays.
3. Press the Scroll Up key once. "Select: Item: Setup" displays.
4. Press ENTER to access the Setup menu. "Setup: Align" displays.
5. Keep pressing the Scroll Up key until "Setup: Telescope" displays.
6. Press ENTER to access the Telescope menu. "Telescope: Focal Length" dis-
plays.
7. Keep pressing the Scroll Down key until "Telescope: Train Drive" displays.
8. Press ENTER to choose the Train Drive option. "Train Drive: Az/RA Train" dis-
plays.
9. Press ENTER to begin Az/R.A. (Right Ascension) training.
10. "Drive Setup: For this...." begins to scroll across the display. This is a reminder to
point your telescope at a terrestrial object. Loosen the R.A. and Dec. locks (17
and 33, Fig. 1d) and point the telescope at an object. Then re-tighten the locks.
Press ENTER when the telescope is pointing at the desired terrestrial object.
11. "Center reference object" displays. Center your target object using the Arrow
keys. When centered, press ENTER.
12. The telescope slews and "Press > until it is centered" displays. Press the Right
Arrow key until the target is centered again. Then press ENTER.
Note: If you pass the object when pressing the Arrow key, you cannot slew
the telescope back in the other direction. Press MODE until "Train Drive:
Az/RA Train" displays and begin the procedure over again.
13. The telescope slews and "Press < until it is centered" displays. Press the Left
Arrow key until the target is centered again. Then press ENTER.
14. "Train Drive: Az/RA Train" displays again. Press the Scroll Down key and "Train
Drive: Alt/Dec Train" displays. Press ENTER to begin Alt/Dec. (Declination) training.
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15. "Drive Setup: For this...." begins to scroll across the display. This is another
reminder to point your telescope at a terrestrial object. Loosen the R.A. and Dec.
locks (17 and 33, Fig. 1d) and point the telescope at an object. Then re-tighten
the locks. Press ENTER when the telescope is pointing at the desired terrestrial
object.
16. "Center reference object" displays. Center your target object using the Arrow
keys. When centered, press ENTER.
V
17. The telescope slews and "Press until it is centered" displays. Press the Up
Arrow key until the target is centered again. Then press ENTER.
Note: Three other align-
ment methods, One-Star,
Two-Star and Three-Star
Polar alignment, are
available as options in the
"Setup: Align" menu. See
page 51 and page 55 for
more information.
18. The telescope slews and "Press V until it is centered" displays. Press the Down
Arrow key until the target is centered again. Then press ENTER. "Train Drive:
Alt/Dec Train" displays again. You have now completed this procedure. Continue
onto the next procedure, EASY ALIGNMENT.
Easy Alignment (Autostar Models Only)
After completing the "Train the Drive" procedure, align your telescope using Autostar.
The fastest and easiest way to start observing with Autostar's Go To capabilities is to
align your telescope using the Easy Alignment.
1. Keep pressing MODE until "Select Item: Setup" is displayed. Press ENTER.
2. "Setup: Align" displays. Press ENTER. "Align: Easy" displays. Press ENTER.
Tip:
The GO TO key also
allows you to perform a
"spiral search." A spiral
search is useful when the
telescope slews to an
object, but that object is
not visible in the eyepiece
after the telescope finishes
its search. (This some-
times occurs during an
alignment procedure.)
3. "German North" displays and a scrolling message prompts you to set your tele-
scope in the polar home position. See SETTINGTHE POLAR HOME POSITION, page
17, for a description of this procedure. Press ENTER after you finish the proce-
dure.
4. Autostar then chooses two stars from its database to align upon. When the tele-
scope slews to the star for alignment, it may not appear in the field of view in the
eyepiece. Use the Arrow keys to move the telescope until the star is visible and
centered in the eyepiece. The alignment star should be easily recognized and be
the brightest star in the area of the sky where the telescope is pointing. See WHICH
ONE'STHE ALIGNMENT STAR, page 18, for more information. When the star is cen-
tered, press ENTER. Repeat the procedure for the second alignment star.
Press GO TO when the
telescope stops slewing.
The telescope begins to
move in a spiral pattern at
a very slow speed (you
may change the slew
speed if you wish—see
SLEW SPEEDS, page 16)
around the search area.
Look through the eyepiece
and when the object does
become visible, press
MODE to stop the spiral
search. Then use the
Arrow keys to center the
object.
Note: Autostar locates alignment stars based on the date, time, and loca-
tion entered. The alignment stars may change from night to night. All that
is required is for the observer to center the selected star in the eyepiece
when prompted.
Go To Saturn (Autostar Models Only)
After performing the Train the Drive and the Easy Alignment procedures, the motor
drive begins operating and the telescope is aligned for a night of viewing. Objects in
the eyepiece should maintain (i.e., track) their position even though the Earth is rotat-
ing beneath the stars.
Important Note: Once aligned, only use the Autostar menus or Arrow
keys to move the telescope. Do not loosen the telescope locks, or move
the base manually, or alignment will be lost.
This exercise demonstrates how to select an object for viewing from Autostar’s data-
base, i.e., Saturn. Note that Saturn is not visible all year long and it may be necessary
for you to choose another object from Autostar's database. However, the procedure
will be identical to the one used for observing Saturn.
1. After the telescope is aligned, “Select Item: Object” displays. Press ENTER. If
“Select Item: Object” is not currently displayed, press MODE repeatedly until it
displays, then press ENTER.
2. “Object: Solar System” displays. Press ENTER.
3. “Solar System: Mercury” displays. Use the Scroll Down key until “Solar System:
Saturn” displays.
4. Press ENTER. “Calculating” displays. Then “Saturn” and a set of coordinates dis-
plays. Saturn’s (and other planets’) coordinates change throughout the year.
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5. Press GO TO. “Saturn: Slewing...” displays and the telescope slews until it finds
Saturn. You may need to use the Arrow keys to center Saturn precisely in the
eyepiece. Autostar then automatically slews (moves) the telescope so that it
tracks Saturn (or whatever other object you may have chosen). Saturn remains
centered in the eyepiece.
Using the Guided Tour (Autostar Models Only)
This example demonstrates using “Tonight’s Best” Guided Tour.
1. After observing Saturn, keep pressing MODE until “Select Item: Object” displays
again.
Fig. 17: The planet Saturn
is over 800 million miles
from the Earth.
2. Press the Scroll Down key twice. “Select Item: Guided Tour” displays.
3. Press ENTER. “Guided Tour: Tonight’s Best” displays. Press ENTER.
Note: If you wish to try out other Guided Tours, press the Scroll Down key
to scroll through other tour choices. When the tour you wish to select dis-
plays, press ENTER.
4. “Tonight’s Best: Searching...” displays. After calculating, “Tonight’s Best: Jupiter”
displays.
Note: Different objects may be displayed on a tour list on any given night.
Press ENTER to display information about the object. Press GO TO to move the
telescope to the object.
5. Press MODE to return to the Tour list. Press the Scroll keys to scroll through the
list. Press ENTER when you find the next object you wish to observe.
6. Press and hold down MODE for two seconds to leave the Guided Tour menu.
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BASIC AUTOSTAR OPERATION
OBJECT MENU
SETUP MENU
Easy alignment
permits all telescope
operations with only
a quick setup.
Select Item:
Object
Important Note: Some
models are equipped with
an Electronic Controller
handbox, rather than the
Autostar Handbox. The
following sections (BASIC
AUTOSTAR OPERATION,
AUTOSTAR MENUS, AND
USEFUL AUTOSTAR
Want to see Mars? The Orion nebula?
The Andromeda galaxy? Select from
over 30,000 database objects and press
GO TO to move the telescope
automatically to an object.
Select Item:
Setup
Select Item:
Event
MEADE
EVENT MENU
UTILITIES MENU
Display the time of
past, present, and future
astronomical events,
such as Moon phases
or meteor showers.
Calculate eyepiece
magnifications;
set timer alerts;
create your own
landmark survey.
The Universe of
Autostar
PROCEDURES), are rele-
vant only to models
equipped with the
Select Item:
Utilities
Select Item:
Guided Tour
Autostar handbox and do
not apply to the EC mod-
els. For more information
about the EC handbox,
see APPENDIX D: EC
HANDBOX, page 62.
GUIDED TOUR
Autostar escorts you
on a tour of tonight's
GLOSSARY
What is an elliptical galaxy?
How far away is the Sun?
best celestial objects
at your viewing location.
Expand your knowledge of
astronomy by displaying terms
and definitions, and other information.
Select Item:
Glossary
Fig. 18: The Autostar Universe.The six primary categories listed in the Select Item menu of
Autostar.
It is important to understand that menu selections are set in a loop (Fig. 19). This means
that pressing the Scroll Down key (7, Fig. 2) cycles down through all the available
options within a given category, then returns to the first option. The Scroll Up key (7,
Fig. 2) cycles up through the options in the opposite order. Note that this capability is a
quick way to get to an option that is near the bottom of the list. The following example
demonstrates this capability.
Object
Event
Guided Tours
Glossary
Utilities
Setup
Example:
To navigate to the “Select Item: Setup” menu option when the “Select Item: Object”
menu is displayed:
1. Press the Scroll Down key five times or the Scroll Up key once.
Fig. 19: Menus set in a
loop.
The screen in Fig. 20 displays two lines of information. The top line shows the current
menu level. The second line displays an option which may be selected within that
menu level. Some options are choices that select the next menu level down. The
Scroll keys move up and down within the list of available options, showing one option
at a time.
Setup
Align
Date
Time
Daylight Saving
Telescope
Targets
etc.
When the desired option is displayed on the second line, press the ENTER key to
choose that option and move down one menu level.
Press the MODE key to leave a level; e.g., the wrong menu option is chosen.
Important Note: No matter how many levels into Autostar are traveled,
each press of the MODE key moves up a level, until the top level, "Select
Item," is reached. Once in the Select Item level, press MODE to return to
the topmost level, "Select Item: Object."
Fig. 20: Menu options dis-
play on the second line.
Use the Scroll keys to
move up or down through
the list of options. Press
ENTER to select the
desired option.
Autostar Navigation Exercise
To demonstrate how the Autostar menu structure works, the following exercise calcu-
lates Sunset time so an evening observing session can be planned.
Note: Before proceeding with this exercise, Autostar must be properly ini-
tialized and aligned (see pages 19 and 21).
To Calculate Sunset time:
1. Press the MODE key several times, until “Select Item: Object” is displayed.
2. Press the Scroll Down key once to display the “Event” option in the “Select Item”
menu.
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3. Press the ENTER key to choose the "Event" option and move down a level.
"Event: Sunrise" is displayed.
4. Press the Scroll Down key once to display the "Sunset" option in the Event menu.
5. Press the ENTER key to choose the "Sunset" option and move down another
level.
6. Autostar calculates the Sunset time based on the current date, time, and location.
Autostar then displays the results of the calculation.
7. Press MODE once to start moving back up through the Autostar levels. The first
level up is the Event menu.
8. Press MODE again to move up another level. This is the top level, "Select Item."
9. Press MODE again to return to the starting point of "Select Item: Object."
Entering Data into Autostar
I
Use the Number keys to enter digits.
Tip:
When multiple choices are
available within a menu
option, the current option is
usually displayed first and
highlighted by a right point-
ing arrow (>).
I
Use the Arrow keys to scroll through numbers 0 through 9 and the alphabet. The
Down Arrow key begins with the letter "A;" the Up Arrow key begins with digit "9."
I
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To move the cursor across the display:
Use the Right or Left Arrow key (5, Fig. 2) to move the cursor from one number
to the next in the display.
Press ENTER when the desired information has been entered.
Navigating Autostar
Autostar's menus are organized for quick and easy navigation:
I
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Press ENTER (2, Fig. 2) to go deeper into Autostar's menu levels.
Press MODE (3, Fig. 2) to move back toward the top menu level.
Press the Scroll keys (7, Fig. 2) to move up and down through the options or lists.
Press the Arrow keys (5, Fig. 2) to move the cursor across the display.
Press the Help (?) key (8, Fig. 2) to access on-line help.
LXD75 TIPS
Look into the Future
The Autostar Date option in the Setup menu is much more than just an entry
of today's date; with it you can look far into the future or learn about past
events. Autostar can calculate the date and times of future events and, except
for eclipses, past events as well (based on the current calendar system). E.g.,
a Sunrise on March 6, 2043 A.D. or the Vernal Equinox in 1776 A.D. To use this
feature, enter the desired date in the Setup: Date menu and select an option in
the Event menu.
Autostar can calculate dates and times for Sunrises, Sunsets, Moonrises,
Moonsets, Moonphases, Solar and Lunar Eclipses (for the next 100 years),
meteor showers, equinoxes and solstices, and the minimums of Algol.
One very practical use of the Date and Time menus is to use the Sunset option
to determine when you can begin your astronomical observing on any given
evening.
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AUTOSTAR'S MENUS
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MENUS
Object Menu
Almost all observing with Autostar is performed using the Object menu category.
(Note: Exceptions include Guided Tour and Landmark Survey. See GO TO SATURN,
)
page 21, for an example of observing using the Object menu. Also see USING THE
GUIDED TOUR, page 22.
Autostar contains many libraries of viewable objects, such as stars, planets, comets,
nebulae and so forth. When one of these objects is selected from a library, Autostar
moves your telescope (if properly aligned) and points it at the selected object.
The Object Menu options include:
Solar System is a library of the eight planets (Earth is not included) in order out from
the Sun, followed by the Moon, asteroids, and comets.
Constellation is a library of all 88 Northern and Southern Hemisphere constellations.
When this menu option is chosen and a constellation name appears on the first line
of the screen, press GO TO once to change the second line to the name of the bright-
est star in the constellation. Press GO TO a second time to slew the telescope to that
star. Use the Scroll keys to cycle through the list of stars in the constellation, from
brightest to dimmest.
Deep Sky is a library of objects outside our Solar System such as nebulae, star clus-
ters, galaxies, and quasars.
Star is a library of stars listed in different categories such as named, double, variable,
or nearby.
Want to learn more about
observing satellites?
Satellite is a library of Earth-orbiting objects such as the International Space Station,
the Hubble Space Telescope, Global Positioning System (GPS) satellites, and geo-
synchronous orbit satellites.
See page 34.
User Objects allows the user to define and store in memory deep-sky objects of spe-
cific interest that are not currently in the Autostar libraries. See Using Autostar to
Find Objects Not in the Libraries, page 33 for more information.
Want to learn more about
Landmarks stores the location of terrestrial points of interest in the permanent
Landmarks?
Autostar database.
See page 34.
Important Note: To use the Landmark function, the telescope must be
located and aligned exactly as when the landmark was added to the data-
base.
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Select: To select a Landmark already in the database (see ADD below), choose
the "Select" option and scroll through the list. Press ENTER to select a
Landmark, then press GO TO and the telescope slews to the object.
Add: To add a Landmark, choose the "Add" option. Enter a name for the
Landmark. Locate and center the Landmark in the eyepiece, then press ENTER.
Identify is an exciting feature for an observer who wants to scan the night sky and
start exploring. After the telescope has been properly aligned, use the Autostar Arrow
keys to move about in the sky. Then follow this procedure:
Important Note: Only use the Arrow keys to move the telescope during
the Identify procedure. Do not loosen the telescope locks or move the
base or alignment is lost.
1. When a desired object is visible in the eyepiece, keep pressing MODE until the
“Select Item: Object” menu is displayed. Press ENTER to select this menu.
2. Scroll through the Object menu options until the “Object: Identify” screen
appears.
3. Press ENTER. Autostar searches the libraries for the identity of the object being
observed.
4. If the telescope is not directly on an Autostar library object, the nearest library
object is located and displayed on the screen. Press GO TO and the telescope
slews to that object.
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Browse allows you to search the library for objects with certain parameters, much like
a search engine. "Edit Parameters" lets you set various parameters for the search,
such as: Object Type, Minimum Elevation, Largest, etc. Once you have set the param-
eters of the search, select "Start Search" and press ENTER. Autostar will display the
results of the search.
Event Menu
The Event menu provides access to dates and times of astronomical events. The
Event database includes:
Want to learn more about
using the Date menu?
See the LXD75 TIPS box,
page 24.
Sunrise and Sunset calculates the time that the Sun rises or sets on the current date.
Find rise and set times for other dates by entering a new date into the “Setup: Date”
menu.
Moonrise and Moonset calculates the time that the Moon rises or sets on the current
date. Find rise and set times for other dates by entering a new date into the “Setup:
Date” menu.
Moon Phases displays the date and time of the next Full, New, 1st Quarter, and 3rd
Quarter Moon.
Meteor Showers provides information on upcoming meteor showers, such as the
Perseids, the Leonids, etc. Also lists the dates of the showers and when they reach
maximum.
Note: Meteors are fast moving objects that cover large areas of the sky and
are usually best observed with the naked eye.
WARNING!
Never use
a Meade
Solar Eclipse lists upcoming Solar Eclipses, including the date and type (total, annu-
lar, or partial) of eclipse, and the location and time of the first and last contacts of the
Moon's shadow. Use the Scroll Up and Down keys to display the available data.
Remember, never use a telescope to look at the Sun! See WARNING! to the left.
®
LXD75-Series
Telescope to look at
the Sun! Looking at
or near the Sun will
cause instant and
irreversible damage
to your eye. Eye
Lunar Eclipse lists upcoming Lunar Eclipses, including the date and type (total, par-
tial, penumbral) of eclipse. Use the Scroll Up and Down keys to display the available
data.
Min. (Minimum) of Algol is the minimum brightness of the dramatic eclipsing binary
star system, Algol. It is relatively close at a distance of 100 light years. Every 2.8 days
during a 10-hour period, Algol undergoes a major change in apparent magnitude as
one of the two stars passes behind the other. The combined magnitude of the two
stars thus dips from +2.1 to a minimum of +3.4 halfway through the eclipse as the sec-
ond star is hidden. Autostar calculates minimum magnitude time at mid-eclipse.
damage is often
painless, so there is
no warning to the
observer that dam-
age has occurred
until it is too late. Do
not point the tele-
scope or its viewfind-
er at or near the Sun.
Do not look through
the telescope or its
viewfinder as it is
moving. Children
should always have
adult supervision
while observing.
Autumn and Vernal Equinox calculates the time and date of the fall or spring equi-
nox of the current year.
Winter and Summer Solstice calculates the time and date of the winter or summer
solstice of the current year.
Glossary Menu
The Glossary menu provides an alphabetical listing of definitions and descriptions for
common astronomical terms and Autostar functions. Access directly through the
Glossary menu or through hypertext words embedded in Autostar. A hypertext word
is any word in [brackets], usually found when using the Autostar Help function or
when reading a scrolling message such as a description of a planet or star. Press
ENTER whenever a hypertext word is on screen and Autostar goes to the glossary
entry for that word.
To access directly from the Glossary menu, use the Scroll keys to scroll through the
alphabet. Press ENTER on the desired letter. Scroll to the desired entry and then
press ENTER to read the description.
Utilities Menu
The Utilities menu provides access to several extra features within Autostar, including
a countdown timer and an alarm. The Utilities functions include:
Timer selects a countdown timer. This feature is useful for functions such as
astrophotography and tracking satellites. To use the Timer, press ENTER, then
choose “Set” or “Start/Stop."
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Set: Enter the time to be counted down, in hours, minutes, and seconds, then press
ENTER.
Start/Stop: Activates the timer set previously. Use the Scroll keys to toggle
between ON and OFF. When ON is displayed, press ENTER to activate the timer.
When the timer runs out, four beeps sound and the timer is deactivated.
Alarm selects a time for an alarm signal as a reminder. To use the Alarm, press
ENTER, then choose "Set" or "Start/Stop."
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Set: Enter the time of day for the alarm to sound, in hours, minutes, and seconds,
then press ENTER.
Start/Stop: Activates the alarm set previously. Use the Scroll keys to toggle
between on and off. When ON is displayed, press ENTER to activate the alarm.
When the alarm time arrives, Autostar beeps. Press ENTER to deactivate the
alarm.
Eyepiece Calc calculates information about an eyepiece for the specific telescope to
which Autostar is connected.
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Field of View: Scroll through a list of available eyepieces. When an eyepiece is
selected, the field of view is calculated.
Magnification: Scroll through a list of available eyepieces. When an eyepiece is
selected, the magnification is calculated.
Suggest: Autostar calculates and suggests the best eyepiece for viewing, based
on the telescope and the object being viewed.
Display Options enables or disables Autostar’s two initial displays. If both displays
are disabled, Autostar begins with the Date display.
I
Sun Warning: Turns the “Sun Warning” message on or off.
I
Getting Started: Turns the “Getting Started” message on or off.
Tip:
Brightness Adj: Adjusts the brightness of the display using the Scroll keys. When com-
If you notice that the text is
"smearing" on the Autostar
display, use the contrast
adjustment menu.
plete, press ENTER.
Contrast Adj: Adjusts the contrast of the display using the Scroll keys. When complete, press
ENTER. The Contrast Adjustment feature is usually only required in very cold weather.
Beep: Turns the beep on or off.
Landmark Survey automatically slews the telescope to all user-defined landmarks
with a short pause at each location. Press ENTER to start the survey. While a slew is
in progress, press any key to skip that object and go to the next landmark on the list.
To observe a landmark for a longer period, press MODE when paused on the object
to stop the survey. Press ENTER to restart the survey at the first object on the list.
Want to learn more about
Landmarks?
See page 34.
Sleep Scope is a power saving option that shuts down Autostar and the telescope
without forgetting its alignment. With "Sleep Scope" selected, press ENTER to acti-
vate the Sleep function. Autostar goes dark, but the internal clock keeps running.
Press any key, except ENTER, to re-activate Autostar and the telescope.
Park Scope is designed for a telescope that is not moved between observing ses-
sions. Align the telescope one time, then use this function to park the telescope. Next
time it is powered up, enter the correct date and time – no alignment is required.
Pressing ENTER causes the telescope to move to its pre-determined Park position.
Once parked, the screen prompts to turn off power.
Important Note: When the "Park Scope" option is chosen and the display
prompts you to turn off the telescope's power, Autostar is unable to be
returned to operation without turning the power off and then back on.
Cord Wrap moves the telescope in such a way as to prevent the cords and cables
attached to your telescope assembly from getting wound around the assembly and tan-
gled as the telescope slews to objects. This menu is set to "On" and cannot be
changed by the user.
Setup Menu
The Setup menu’s primary functions are for setting up telescope alignment. However,
there are numerous other features available within the Setup menu, including:
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Date changes the date used by Autostar. This function is useful to check events in the
past or future. For example, set the Date menu for a day three months in the future.
Then check the "Select Item: Event" menu for the Sunset time on that date. See
EVENT MENU, page 27.
Want to learn more about
using the Date menu?
See the LXD75 TIPS box,
page 24.
Time changes the time entered into Autostar. Setting the correct time is critical for
Autostar to properly calculate locations and events. Time may be set to 24-hour mode
(military time) by selecting the "blank" option (i.e., no option is displayed) which fol-
lows the "AM" and "PM" options.
Daylight Saving is used to enable or disable Daylight Savings time.
Note: Daylight Savings Time may be referred to by different names in vari-
ous areas of the world. Check local time to verify.
Telescope accesses several options, including:
I
Telescope Model: Allows you to select the telescope model connected to
Autostar.
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Focal Length: Displays the focal length of the selected telescope.
Az/R.A. Ratio and Alt/Dec. Ratio: The Az (Azimuth) or the R.A. (Right
Ascension) ratio and Alt (Altitude) or Dec. (Declination) ratio refers to the gears of
the telescope's motors. Do not alter these numbers.
I
Az/R.A. Percent: This option allows you to change the AZ (azimuth) or R.A. (right
ascension) backlash, i.e., the way the Arrow keys move the telescope along the
azimuth or R.A. axes. If you enter a value near 100, the telescope tube responds
more quickly (it responds immediately at 100%) as you hold down an Arrow key
and also slews (moves) the tube more quickly. If you enter a value near 0, it takes
longer for the tube to respond as you hold down an Arrow key and also slews the
tube more slowly. Experiment with this option. Try changing the percent value
until you get a "feel" for the Arrow keys that is comfortable for you.
I
Alt/Dec. Percent: The option operates identical to the Az/R.A. Percent option
(see above), but allows you to change the altitude or declination backlash, i.e.,
the way the telescope responds to the Arrow keys when moving along the altitude
or declination axes.
Want to learn more about
Training the Drive? See
the LXD75 TIPS box, page
20.
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Train Drive: Trains the Altitude/Declination and Azimuth/R.A. motors to locate
objects with more precision.
Tracking Rate: Changes the speed at which the telescope tracks targets in the
sky.
LXD75 TIPS
Observing Considerations
Try to pick an observing site away from street and house lights and car head-
lights. While this is not always possible, the darker the site, the better.
•
•
Give your eyes about ten minutes to adjust to the darkness before observing.
Give your eyes a rest from observing every ten or fifteen minutes to relieve
eyestrain.
•
Try not to use a standard flashlight. Experienced observers use red LED flash-
lights, the red utility light on the Autostar handbox, or tape red cellophane over
their flashlights to use for setup and map reading so they don’t have to con-
tinually readjust their eyes to the darkness. Be careful not to shine bright lights
if there are other observers in the area. Do not shine a flashlight into the tele-
scope while someone is observing!
•
•
Dress warmly. It gets chilly when you’re sitting for prolonged periods.
Practice setting up your equipment during the day or in a lighted area to
become familiar with it before going to a dark site.
•
•
Use your 26mm eyepiece to view terrestrial objects and wider areas of space,
such as open star clusters. Use an optional 9mm eyepiece when you wish to
view something up close, such as craters on the Moon or the rings of Saturn.
Know your observing site. If you’re going to try out an unfamiliar site, check it
out in the daylight for possible obstructions and pitfalls.
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a. Sidereal: The default tracking setting for Autostar; sidereal rate is the stan-
dard rate at which stars move from East to West across the sky due to the
rotation of the Earth.
b. Lunar: Choose this option to properly track the Moon over long observing
sessions.
c. Custom: Allows entry of user-defined tracking rates.
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Reverse L/R: Reverses the functions of the Left and Right Arrow keys (i.e., the
Right key moves the telescope to the left).
Tip:
Reverse U/D: Reverses the functions of the Up and Down Arrow keys (i.e., the
Up key moves the telescope down).
The Reverse L/R and U/D
functions are useful if you
are observing in the
Southern hemisphere.
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Quiet Slew: Sets the maximum slew rate to 1.5° for quieter operation.
Max Elevation: Allows you to enter a value in degrees that sets a limit as to how
far the optical tube can swing upward during a programmed slew. (Note that it
does not prevent you from performing a manual slew past this limit.) This is use-
ful when you have a camera or other peripheral attached to the telescope—you
can prevent it from striking the telescope base.
I
Min AOS (Acquisition of Signal): Allows you enter a value in degrees. This
value represents the altitude at which your telescope begins to slew when
acquiring a satellite track. This is useful when you are observing satellites, but a
tall tree or building is obstructing the telescope. For example, you might begin to
track the satellite at 15° altitude, instead of 5°. See OBSERVING SATELLITES,
page 34, for more information about satellites.
I
Calibrate Motor: If the telescope motors appear to have a problem, use this
option to retest the motors before performing a Reset. This option is also used if
an Autostar unit is moved between telescopes, to match Autostar to the new tel-
escope. To calibrate the motors, select this option and press ENTER.
Do you want to learn how
to perform the periodic
error correction proce-
dure? See SMART DRIVE,
page 56.
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Smart Drive: Allows you to perform periodic error correction (PEC) on the R.A.
drive worm gear. Must be performed with a high-power reticle (eg., 9mm).
High Precision: If High Precision is turned on, when looking for a faint celestial
object (i.e., a nebula or galaxy), Autostar first slews to a nearby bright star and
displays "ENTER to Sync." Center the star in the eyepiece, then press ENTER.
At that point the telescope has a high precision alignment to that part of the sky
and it then slews to the object that was originally requested.
Tip:
If the "ENTER to Sync"
feature is accessed by
mistake (holding the
ENTER key for more than
2 seconds), press MODE
to return to the previous
screen.
Targets switches between Astronomical targets and Terrestrial targets. If
"Astronomical" is selected, the telescope tracking motor is activated and any object
you observe will remain centered in the eyepiece. If "Terrestrial" is selected, the track-
ing motor is turned off. To learn how to track an object automatically, see page 18.
Site provides access to several options including:
I
Select: Displays the currently selected observing site. Use the Scroll keys to
cycle through all available sites (see ADD below). Press ENTER when the site
you wish to select displays. Use this option when you move to a different geo-
graphic location.
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Add: Allows you to add new observing sites to the database (up to six sites may
be stored). Scroll through the list of Countries/States. Press ENTER when the site
you wish to add displays. Then choose the desired city in the same manner.
Want to learn more about
adding and editing
sites? See page 32.
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Delete: Deletes a stored site from the database.
Time Zone
Atlantic
Eastern
Central
Mountain
Pacific
Shift
Edit: Edits a selected site, including: the name, latitude, longitude, and time
zone. Time Zone refers to the Greenwich Mean Time (GMT) time zone shift.
Users West of Greenwich, England use “-” hours, East of Greenwich use “+”
hours. For the United States, look up the time zone shift in Table 1.
-4 Hours
-5 Hours
-6 Hours
-7 Hours
-8 Hours
-9 Hours
-10 Hours
Note: Autostar compensates for daylight savings time, if selected. See
SETUP MENU: DAYLIGHT SAVING, page 29.
Alaska
Hawaii
Table 1: Time Zone Shift.
Owner Info accesses the owner information menu, including:
I
Name: Users may enter both their first and last names using the Up and Down
Arrow keys to cycle through the alphabet. Use the Right and Left Arrow keys to
move through the text. Press ENTER when the entry is complete.
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Address: Use the Up and Down Arrow keys to enter your street address, city,
state, and zip code. Press ENTER when the entry is complete.
Note: The Download and
Clone functions require
the optional #505
Astrofinder Software and
Cable Connector Kit. See
the instruction sheet
included with the kit for
more information on how
to download.
Download transfers information from another Autostar. During the operation, the
warning “Downloading Do Not Turn Off” appears.
Clone uploads information from one Autostar handbox to another. Three options are
available:
I
Catalogs: Sends only user-defined object information, such as new satellite
orbits or comet data to another Autostar handbox.
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Software: Sends only the basic Autostar software. This is useful if one user has
downloaded a new version of Autostar software from the Meade website
I
All: Everything–user-defined information and Autostar software–is sent to anoth-
er Autostar.
Statistics provides basic statistical data about Autostar, including:
I
Characters Free: Shows how much room is available in user-defined object
memory.
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Version: Shows the current version of the Autostar software.
Reset completely resets Autostar. Most values entered into the menus revert to fac-
tory defaults. Autostar requires initialization after a Reset before proceeding with
observations. See INITIALIZING AUTOSTAR, page 19.
LXD75 TIPS
Surf the Web
One of the most exciting resources for astronomy is the internet. The internet is full
of websites with new images, discoveries, and the latest astronomical information.
For example, when comet Hale-Bopp made its approach to our Sun in 1998,
astronomers around the world posted new photos daily.
You can find websites for almost any topic relating to astronomy on the internet. Try
the following key word searches: NASA, Hubble, HST, astronomy, Messier, satellite,
nebula, black hole, variable stars, etc.
Check out Meade’s website for the latest product and technical information. You can
download the latest software revisions, links to other astronomical sites, coordinates
of celestial objects and the latest satellite tracking information for your Autostar
handset. See page 34 for more information. You’ll find our website at:
Here are some other sites you might find interesting:
• Sky & Telescope:
• Astronomy:
• The Starfield:
• Astronomy Picture of the Day:
• Heavens Above (satellite observing information):
• Photographic Atlas of the Moon:
• Hubble Space Telescope Public Pictures
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USEFUL AUTOSTAR PROCEDURES
Before trying out the examples in this section, familiarize yourself with the basic oper-
ations of Autostar described earlier in this manual. The following examples assume
that you have a basic knowledge of Autostar and understand how to scroll to a desired
menu or menu option, and how to enter numbers and text. It also assumes that you
have initialized and aligned your telescope.
Adding Observing Sites
If you plan to observe using Autostar at different geographic locations, you can store
up to six observation sites in Autostar's memory to help simplify your telescope setup.
Perform these procedures using the Site options (Add, Select, Delete, Edit) of the
Setup menu.
To Add a Site to the user-defined site list:
In this example, you will choose a city and add it to the database list. You will then
select the site to enable it.
1. Navigate to the "Setup: Site" menu. Press ENTER,
2. Scroll through the options until "Site: Add" displays. Press ENTER.
3. Scroll through the list of countries/states. Press ENTER when the country/state
you wish to add displays.
4. Scroll through the list of cities. Press ENTER when the city you wish to add dis-
plays. The Site is now added to the database. You may add 5 sites using this
method (the sixth site is the site you added during the manual initialization
process).
5. To choose a site, navigate to "Setup: Select." Press ENTER. Scroll through the
list of sites. When the desired site displays, press ENTER.
To Edit a Site
In this procedure, you will enter a location that is not available in the Autostar data-
base by editing data of a nearby site. You will edit the location's name, latitude. lon-
gitude and the time zone shift. You will then select the site to enable it.
You will need to know the latitude and longitude of your location to perform this pro-
cedure.
1. Using the Add option, choose a site on the list that is closest to your observing
site and press ENTER so that the site is added to your observing sites list.
Choosing a site already on the list (as opposed to using the "Custom" feature)
makes it easier to edit, as the "Time Zone" value may not need to be changed.
2. Scroll to "Site: Edit" and press ENTER. "Edit: Name" displays. Press ENTER.
3. The name of the site you have just entered to your list displays; if it does not,
scroll to the site.
4. Using the Arrow keys, change the name of the site so that it now reads the name
of your observing location. Press ENTER. "Edit: Name" displays again.
5. Press the Scroll Down key and "Edit: Latitude" displays. Press ENTER.
6. Using the Number Keys, enter the latitude of your observing site and then press
ENTER. "Edit: Latitude" displays again.
7. Press the Scroll Down key and "Edit: Longitude" displays. Press ENTER.
8. Using the Number Keys, enter the longitude of your observing site and then press
ENTER. "Edit: Longitude" displays again.
Time Zone
Atlantic
Eastern
Central
Mountain
Pacific
Shift
-4 Hours
-5 Hours
-6 Hours
-7 Hours
-8 Hours
-9 Hours
-10 Hours
9. Press the Scroll Down key and "Edit: Time Zone" displays. Press ENTER. (If the
site you chose from the list in step 1 has the same Time Zone as the site you are
editing, just press ENTER again to go on to the next step.) "Time Zone" refers to
the Greenwich Time Zone shift. Users West of Greenwich, use "-" hours (one
hour per time zone) and users East of Greenwich use "+" hours. For the United
States, look up the shift in TABLE 1, at the left.
Alaska
Hawaii
Table 1: Time Zone Shift.
10. After entering the shift, press ENTER. "Edit Time Zone" displays.
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11. Press MODE. "Site: Edit" displays.
12. Using the Arrow keys, scroll to "Site: Select." The site you have just edited dis-
plays. Press ENTER to select the site or press MODE to exit.
Using Autostar to Find Objects Not in the Libraries
In this procedure, you will enter coordinates of celestial objects that do not appear in
any of the Autostar libraries. You will enter the object's name and R.A. and Dec. coor-
dinates (required information). You may also enter the object's magnitude and size
(optional information).
Although Autostar contains an extensive database of celestial objects (stars, nebulae,
planets, etc.) that you can observe, you may eventually want to view objects that are
not part of a library. Autostar provides a feature that allows you to enter an object's
R.A and Dec. coordinates in the "User: Objects" option of the Object menu and allows
automatic slewing of the telescope to the user-entered coordinates.
In order to use this menu option, you first need to look up the R.A. and Dec. coordi-
nates of the object or objects you wish to observe. Check out your local library, com-
puter store, or bookstore for astronomy books, CD Roms, or magazines (such as Sky
& Telescope or Astronomy), to find coordinates of celestial objects. The objects/coor-
dinates you enter become part of your own permanent database, called "User
Objects."
To enter coordinates of an object into the "User: Objects" option of the Object
menu:
1. Make sure Autostar has been initialized and the telescope has been aligned.
Tip:
2. After the telescope is aligned, "Select Item: Object" displays. (If necessary, use
the Scroll keys to scroll through the menus, as previously described, to find this
option.) Press ENTER.
Entering R.A. and Dec.
Coordinates of an object
without using the menus:
If you do not wish to navigate
through the menus, a more
direct way to enter coordi-
nates is to press and hold
MODE for two seconds or
more. R.A. and Dec. coordi-
nates display. Press GO TO.
"Object Position" and a set of
coordinates displays. Enter
the R.A. and Dec. coordinates
of any celestial object using
Number keys, overwriting the
coordinates currently dis-
played. As soon as the coor-
dinates are entered, Autostar
slews the telescope to the
coordinates. Note that the tel-
escope must be initialized
(see page 19), placed in the
Home position (see page 17),
and aligned (see page 21) for
this procedure to operate
properly.
3. "Object: Solar System" displays. Keep pressing the Scroll Up key until "Object:
User Object" displays and press ENTER.
4. "User Object: Select" displays. Press the Scroll Down key once. "User Object:
Add" displays. Press ENTER.
5. "Name" displays on the top line and a blinking cursor on the second line. Use the
Arrow keys, as previously described, to enter the name of the object you wish to
add to the database. When you are finished, press ENTER.
6. "Right Asc.: 00.00.0" displays. Use the Number keys to enter the digits for the
Right Ascension coordinate of your object. When you are finished, press ENTER.
7. "Declination: +00°.00' " displays. Use the Number keys to enter the digits for the
Declination coordinate of your object. If necessary, use the Scroll Keys to change
"+" to "-." When you are finished, press ENTER.
8. Autostar then prompts you to enter the size of the object. This step is optional.
Use the Number keys to enter the size (in arc-minutes), if so desired, and press
ENTER to go to the next display. If you do not wish to enter this information, sim-
ply press ENTER.
9. Autostar then prompts you to enter the magnitude of the object. This step is also
optional. Use the Number keys to enter this information, if so desired, and press
ENTER to go to the next display. "User Object: Add" displays again.
However, if you wish to store
the coordinates of an object
in memory, use the method
described at the right.
To GO TO a user-entered object
In this procedure, you will choose an object from the User Object list and GO TO the
object.
1. With "User Object: Add" displayed, press the Scroll Up key once. "User Object:
Select" displays. Press ENTER.
2. Use the Scroll keys (if necessary) to scroll to the desired object. Press ENTER.
3. The name of the object and the Right Ascension and Declination coordinates dis-
play.
4. Press GO TO and the telescope slews to the object.
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Observing Satellites
In this procedure, you will prepare your telescope to observe a satellite pass.
1. Navigate to the "Object: Satellite" menu option and press ENTER.
2. Use the Scroll keys to scroll through the list of satellites.
3. Select a satellite from the list and press ENTER.
4. "Calculating...." and then "Tracking..." displays. If the satellite is going to make a
pass, "Located" displays.
5. Use the Scroll keys to display data about the pass: aos – acquisition of signal and
los – loss of signal. If you subtract the aos from the los, you can calculate how
long the satellite will be visible. Location information also displays.
6. "Alarm" displays after the location information. Press ENTER and Autostar auto-
matically sets the alarm to sound a minute before the satellite's scheduled
appearance. You may return to regular observations until the alarm goes off.
7. When the alarm goes off, return to the Satellite menu and press a Scroll key until
the desired satellite is on the top line of the display.
8. Press GO TO. Autostar slews the telescope to where the satellite should appear.
The motor drive stops and a countdown is displayed.
Note: If the scheduled appearance position of the satellite is obstructed
(i.e., by a building, tree, or hill), press ENTER and Autostar starts to move
the telescope along the expected satellite track. When the track clears the
obstruction, press ENTER again to pause the telescope, then continue
with this procedure.
9. With about 20 seconds left on the countdown timer, start watching through the tel-
escope viewfinder for the satellite to enter the field of view.
10. When the satellite enters the viewfinder field of view, press ENTER. The tele-
scope starts to track with the satellite.
Tip:
11. Use the Autostar Arrow keys to center the object in the viewfinder, then look
through the eyepiece to view the object.
To easiest way to get
satellite information is to go
to the Meade website and
click “Autostar Update” in
the Customer Support sec-
tion. Follow the on-screen
instructions to automatically
download the information to
your Autostar handbox.
Satellite orbits change and new satellites (including the Space Shuttle) are launched.
updated information and instructions on how to download this data to Autostar. If
orbital parameters are more than one month old, the satellite pass may not happen at
the time predicted by Autostar. Downloading requires the optional #505 AstroFinder™
Software and Cable Connector Kit. See OPTIONAL ACCESSORIES, page 38.
Note: Satellite observing is an exciting challenge. Most satellites are in
low orbit, travelling at approximately 17,500 mph. When visible, they move
quickly across the sky and are only in the field of view for a few minutes,
requiring Autostar to slew the telescope rapidly. Best viewing is near
Sunrise or Sunset when the sky is still dark. Viewing in the middle of the
night can be problematic because the satellite may pass overhead, but not
be visible as it is in the Earth's shadow.
The optional #505
Astrofinder Software and
Cable Connector Kit is
required to use the Autostar
Update Utility.
Landmarks
Tip:
To use the Landmark func-
tion, the telescope must be
located and aligned exactly
as when the landmark(s)
was added to the database.
This menu option allows you to define and store terrestrial objects in the Landmark
database. First, a landmark needs to be stored in memory using the "Landmark: Add"
option. To view a landmark, use the "Landmark: Select" option. Landmarks may also
be viewed using the "Landmark Survey" option in the Utilities menu.
To Add a landmark to the database:
In this procedure, you will store the location of terrestrial landmarks in Autostar's
memory.
1. Note for future reference where the telescope is located. Select an easily recog-
nizable reference object and center the object in the telescope eyepiece. Each time
you wish to view landmarks you have added to the database, setup the telescope
in this location and center the reference object in the eyepiece. If you do not use a
consistent point of reference, the telescope will not be able to locate the objects you
have added to the database.
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Another setup method is to select an object from the Landmark database. See TO
SELECT A LANDMARK FROMTHE DATABASE below. Then manually move the tele-
scope's optical tube and center this object in the telescope eyepiece.
2. Display the "Setup: Targets" menu option. Choose "Terrestrial" and press
ENTER. "Setup: Targets" displays again. Choosing this option turns off tracking
for astronomical objects which is not useful for the viewing of terrestrial objects
such as those in the Landmark database. Be sure to change this option back to
"Astronomical" when you wish to view celestial objects again.
3. Press MODE once. "Select Item: Setup" displays.
4. Press the Scroll Down key once and "Select Item: Object" displays. Press
ENTER. "Object: Solar System" displays.
5. Press the Scroll Up key twice and "Object: Landmarks" displays. Press ENTER.
"Landmark: Select" displays.
6. Press the Scroll Down key once. "Landmark: Add" displays. Press ENTER.
7. "Landmark Name" displays. Using Arrow keys, enter a name for the landmark
you wish to add to the database. When finished, press ENTER.
8. "Center Landmark. Press Enter" displays. Using only the Arrow keys (do not
manually move the telescope), move the telescope to the desired landmark and
center the object in the eyepiece. Press ENTER. The object is now stored in
memory.
9. "Landmark: Add" displays. If you wish to add more landmarks, repeat steps 5
through 7.
To Select a landmark from the database
1. Make sure the telescope is located and aligned exactly as when the desired land-
mark was entered into memory.
2. Display the "Landmark: Select" menu option. Press ENTER.
3. Use the Scroll keys to scroll through the list of objects you have previously
entered. When the desired object displays, press ENTER to select the object.
Use the Scroll keys to scroll through location information about the object, if
desired. Press GO TO to slew the telescope to the landmark.
4. Press MODE to exit.
To perform a Landmark Survey
This procedure allows you to perform a tour of the objects entered in the "Object:
Landmark" menu option—note that the Landmark Survey will function only if you have
previously entered objects in the Landmark menu.
1. Navigate to the "Utilities: Landmark Survey" menu and press ENTER.
2. "Landmark Survey: Slewing..." displays. The telescope moves to the first object
on the Survey list and displays the name of the object.
3. Press MODE to pause the Survey. Press ENTER to restart the survey at the first
object of the survey.
To Check on the Available Memory
Autostar has a limited amount of memory. Once you begin to store Landmarks, user
objects and other bits of information in Autostar, you will begin to use up memory. This
procedure allows you to check on how much memory is still available.
1. Navigate to the "Setup: Statistics" menu option and press ENTER.
2. "Statistics: 37.2K Char. Free" displays. This is the amount of memory that is still
available to the user.
35
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PHOTOGRAPHY
Photography through an LXD75 Schmidt-Newtonian and Newtonian Reflector telescope
requires an LXD75-Series T-Adapter (supplied) attached to the telescope (Fig. 22a).
Through-the-telescope photography is possible with any 35mm camera body with a
removable lens. In this way, the telescope effectively becomes the lens of the camera.
Unthread the focuser extension tube (Fig. 22b) from the focuser drawtube to remove
from the focuser assembly. The T-Adapter (2, Fig. 22a) threads onto the focuser, fol-
lowed by the camera body (1, Fig. 22a).
To orient an object in the viewfinder of the 35mm camera body, use a small jeweler’s
screwdriver to slightly loosen three adjustment screws around the outer knurled ring
of the T-Adapter. Rotate the camera body to achieve proper orientation of the object;
then re-tighten the adjustment screws.
B
Photography through a long lens such as the LXD75-Series requires special technique
for good results, and the photographer should probably expect to waste a roll or two
of film in acquiring this technique. Long-lens photography has its own rewards, how-
ever, rewards that short-focus lenses cannot duplicate.
d
C
Fig. 22a: LXD75-Series T-Adapter
attached to focuser assembly and
camera.
(1) Camera Body, (2) T-Adapter,
(3) Focus Knob.
A few tips on photography with the LXD75-Series telescopes:
1. Use a cable-operated shutter release. Touching the camera body to initiate shut-
ter operation almost certainly introduces undesirable vibrations.
2. Focus the image with extreme care. While observing the subject through the cam-
era’s reflex viewfinder, turn the telescope’s focus knob (3, Fig. 22a) to achieve the
sharpest possible focus. Note that some 35mm cameras may have an optional
focusing screen (available from the manufacturer) for use with a long telephoto
lens. This screen provides a brighter and clearer image to focus, and is highly rec-
ommended.
3. Correct shutter speeds vary widely, depending on lighting conditions and film
used. Trial-and-error is the best way to determine proper shutter speed in any
given application.
Focuser
Extension
Tube
Note: The camera used with your telescope may have an exposure meter
that is still active when the standard lens is removed and the body is con-
nected to the telescope with the T–Adapter. If used for terrestrial photog-
raphy, the camera meter should be acceptable. If used for astrophotogra-
phy, the meter probably will not provide good results since camera meters
are not made to compensate for a dark sky.
Fig. 22b: Focuser Extension
Drawtube with eyepiece holder and
eyepiece attached.
4. Terrestrial photography through the LXD75-Series is sensitive to heat waves rising
from the Earth’s surface. Long distance photography is best accomplished in the
early morning hours before the earth has had time to build up heat.
5. Photography of the Moon and planets through the LXD75-Series can be especial-
ly gratifying, but points 1 through 4 should be particularly noted in this case.
Photography with Meade’s Autostar Suite™
The Autostar Suite with Meade LPI™ (Lunar Planetary Imager) and Planetarium soft-
ware turns your Meade LXD75 telescope, Autostar and PC into even more powerful
astronomical instrument. LPI (Lunar Planetary Imager, Fig. 23) combines the power of
an electronic astronomical imager with the simplicity of a web cam.
• Achieve great results the first time out on the Moon, planets, brighter deep-sky
objects and terrestrial targets.
Fig. 23: The Lunar
Planetary Imager.
• Easy to use with real-time display of object on your PC screen. Just center, focus
and shoot.
• Magic Eye software-assisted focusing.
The Autostar Suite Software includes powerful tools to help you get the most from your
Meade LXD telescope:
• Sophisticated planetarium program with over 19 million objects.
• Select objects from the 19 million objects in the planetarium display and the
telescope slews to those objects.
• Create your own Guided Tours.
36
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OPTIONAL ACCESSORIES
A wide assortment of professional Meade accessories is available for the LXD75-Series
telescope models. The premium quality of these accessories is well-suited to the qual-
ity of the instrument itself. Consult the Meade General Catalog for complete details
on these and other accessories.
6” f/5
8” f/4
10” f/4
Eyepiece/Apparent Field
Power/Actual Field
Power/Actual Field
Power/Actual Field
Super Plössl Eyepieces (4-elements; 1.25” O.D.)
6.4mm/52°
9.7mm/52°
12.4mm/52°
15mm/52°
20mm/52°
26mm/52°
32mm/52°
40mm/44°
119/0.44°
79/0.66°
61/0.85°
51/1.02°
38/1.36°
29/1.77°
24/2.18°
19/2.31°
127/0.41°
84/0.62°
65/0.79°
54/1.96°
41/1.28°
31/1.67°
25/2.05°
20/2.17°
159/0.33°
105/0.50°
82/0.63°
68/0.77°
51/1.02°
39/1.33°
32/1.64°
25/1.73°
Super Wide Angle Eyepieces (6-elements; 1.25” O.D., except as noted)
Fig. 24: Series 4000 Eyepieces.
13.8mm/67°
55/1.21°
42/1.58°
31/2.15°
24/2.81°
19/3.52°
59/1.14°
45/1.49°
33/2.02°
25/2.64°
20/3.30°
74/0.91°
56/1.19°
41/1.62°
32/2.11°
25/2.64°
18mm/67°
24.5mm/67°
32mm/67° (2" O.D.)
40mm/67° (2" O.D.)
Ultra Wide Angle Eyepieces (8-elements; 1.25” O.D., except as noted)
4.7mm/84°
6.7mm/84°
8.8mm/84° (1.25
14mm/84° (1.25
162/0.52°
114/0.74°
87/0.97°
54/1.54°
173/0.49°
121/0.69°
92/0.91°
58/1.45°
216/0.39°
152/0.55°
115/0.73°
73/1.16°
"
"
- 2
"
"
O.D.)
O.D.)
- 2
Fig. 25: #140 2x Barlow Lens.
5” f/9.3
6” f/8
8” f/10
Eyepiece/Apparent Field
Power/Actual Field
Power/Actual Field
Power/Actual Field
Super Plössl Eyepieces (4-elements; 1.25” O.D.)
6.4mm/52°
9.7mm/52°
12.4mm/52°
15mm/52°
20mm/52°
26mm/52°
32mm/52°
40mm/44°
184/0.28°
122/0.43°
95/0.55°
79/0.66°
59/0.88°
45/1.15°
37/1.41°
30/1.49°
188/0.28°
124/0.42°
97/0.54°
80/0.65°
60/0.87°
46/1.13°
38/1.39°
30/1.47°
313/0.17°
206/0.25°
161/0.32°
133/0.39°
100/0.52°
77/0.68°
63/0.83°
50/0.88°
Fig. 26: #905 Variable Polarizer.
Super Wide Angle Eyepieces (6-elements; 1.25” O.D., except as noted)
13.8mm/67°
18mm/67°
24.5mm/67°
32mm/67° (2" O.D.)
40mm/67° (2" O.D.)
86/0.78°
66/1.02°
48/1.39°
37/1.82°
30/2.27°
87/0.77°
67/1.01°
49/1.37°
38/1.79°
30/2.23°
145/0.46°
111/0.60°
82/0.82°
63/1.07°
50/1.34°
Ultra Wide Angle Eyepieces (8-elements; 1.25” O.D., except as noted)
4.7mm/84°
6.7mm/84°
8.8mm/84° (1.25
14mm/84° (1.25
251/0.33°
176/0.48°
O.D.) 134/0.63°
255/0.33°
179/0.47°
136/0.62°
86/0.98°
426/0.20°
299/0.28°
227/0.37°
143/0.59°
Fig. 27: Series 4000 8 - 24mm Zoom
Eyepiece.
"
"
- 2
"
"
- 2
O.D.)
84/1.00°
37
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Series 4000 8 - 24mm Zoom Eyepiece: The internal zoom optics of this eyepiece
move on smooth, precisely machined surfaces which maintain optical collimation at
all zoom settings. A scale graduated in 1mm units indicates the zoom focal length in
operation. An excellent addition to any eyepiece set.
#140 2x Barlow Lens: A 3-element design, doubles each eyepiece power while
maintaining uncompromised image resolution, color correction, and contrast. Insert
the #140 into the telescope’s eyepiece holder first, followed by the diagonal (as appli-
cable) and eyepiece. The #126 2x Barlow Lens, a compact 2-element alternative to
the #140, may also be employed with any LXD75-Series telescope.
#905 Variable Polarizer (1.25"): The #905 system includes 2 Polarizer filters mount-
ed in a specially-machined cell, for glare-reduction in observing the Moon. Rotate the
thumbscrew at the side of the unit to achieve light transmission between 5% and
25% of its original value. The #905 inserts into the diagonal of the telescope, followed
by an eyepiece.
Fig. 28: Series 4000 Photo-Visual
Series 4000 Photo-Visual Color Filters: Color filters significantly enhance visual
and photographic image contrast of the Moon and planets. Each filter threads into
the barrel of any Meade 1.25" eyepiece, and into the barrels of virtually all other eye-
piece brands as well. Meade filters are available in 12 colors for lunar and planetary
applications, and in Neutral Density as a lunar glare-reduction filter.
Series 4000 Nebular Filters: A modern boon to the city-dwelling deep-space
observer, the interference nebular filter effectively cancels out the effects of most
urban light pollution, while leaving the light of deep-space nebular emissions virtual-
ly unattenuated. Meade Series 4000 Nebular Filters utilize the very latest in coating
technology, and are available with threaded cells for eyepieces or for attachment to
the rear cells of Meade Schmidt-Cassegrain models.
#928 45° Erect-Image Diagonal Prism: Primarily used for terrestrial viewing, this
prism presents a correctly-oriented image at a comfortable 45° viewing angle.
Fig. 29: Series 4000 Nebular Filters.
#547 Power Adapter with Cable: Includes a 25 ft. cord and permits powering from a
standard home (115v AC) outlet. The #547F Power Adapter is available for 220v AC
outlets.
#607 Cigarette Lighter Adapter: Power a LXD75-Series telescope by means of an
automobile cigarette lighter plug. The LXD75 telescope may be powered for a full
night’s observing without risk of car-battery drain.
#62T-Adapter: The T-Adapter is the basic means of prime-focus photography through
all Meade Schmidt-Cassegrain models. Thread the T-Adapter on to the rear cell of
your telescope, followed by a T-Mount for your 35mm camera, and the camera body
is rigidly coupled to the telescope.
Piggyback Brackets: Piggyback photography is one of the most popular and easiest
ways to get started in astrophotography. Attach your 35mm camera, with its own
35mm-to-250mm lens, atop your LXD75 in equatorial mode, and guiding the camera
through the main telescope, wide-field photos of the Milky Way of remarkable detail
and clarity can be taken.
Dew Shield: In moist climates, water particles suspended in the atmosphere may
condense on the front surface of the telescope's correcting plate. This dew formation
may be inhibited to a significant extent by the addition of a dew shield, essentially an
extension tube attaching to the front-cell of the telescope. #608 for Meade Schmidt-
Cassegrain SC-8 model.
#905 Variable Polarizer (1.25"): #1A Skylight Filter: The #905 system includes 2
Polarizer filters mounted in a specially-machined cell, for glare-reduction in observ-
ing the Moon. Rotate the thumbscrew at the side of the unit to achieve light trans-
mission between 5% and 25% of its original value. The #905 inserts into the diago-
nal of the telescope, followed by an eyepiece. The #1A Skylight Filter threads onto
the rear cell of the Meade Schmidt-Cassegrain SC-8 model and effectively seals the
interior of the telescope from dust. All other rear cell accessories may then be thread-
ed to the #1A filter. The filter increases visual and photographic contrast, decreases
glare, and helps to penetrate haze.
38
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#1205 Electric focuser: For use with LXD75 Schmidt-Cassegrain SC-8 model.
Meade electric focusers are uniquely designed to yield smooth, precise microfocus-
ing of the image, without disabling the manual focus knob, which may be used for
rapid coarse focusing. Includes push-button hand controller with self-contained (user
provided) battery.
#1209 Microfocuser: For use with LXD75 Schmidt-Cassegrain SC-8 model.
Supplied with a handbox, the microfocuser threads directly to the rear cell of model
SC-8. Permits precise focusing of the image during visual or photographic applica-
tion, during CCD applications maintains precise image centration on even the small-
est CCD chips. Operates at four speeds, from extremely slow to fast; accepts both
2" and 1.25" eyepiece barrels. Requires 8 x AAA (user-supplied batteries).
Series 4000 Plössl 9mm Illuminated Reticle Eyepiece: The most advanced com-
mercially-available illuminated reticle eyepiece, this Series 4000 Plössl 9mm model,
powered by an internal battery, includes micrometric x-y positioning controls which
greatly facilitate locking onto the guide star: Turn the finely-threaded controls and
place the reticle’s crossline pattern precisely at the desired position in the field. The
sharp, high-power imaging of the 4-element, multi-coated Plössl optical system is
complemented by a rubber eyecup (foldable for eyeglass wearers) that shuts out dis-
tracting stray light from the observer’s eye. The upper (lens) section of the eyepiece
rotates on a fine thread for precise diopter adjustment to the user’s eye. Reticle pat-
tern is a double crossline with two concentric circles.
Fig. 30: Optional Autostar
handbox for EC model users.
™
Optional #497 Autostar Computer Controller for LXD75 EC Users: One of the
most important advances in telescope control in the past 25 years, the Meade
Autostar Computer Controller turns your LXD75 EC model into an automatic celestial
object locating system. Just plug Autostar into the telescope’s HBX port in place of the
standard-equipment Electronic Controller, do a quick telescope alignment, and you
are ready to observe any object in the Autostar’s 30,000-object database.
Any of Autostar’s database objects can be called up and entered on the hand con-
troller display in seconds. The observer then simply presses the GO TO pushbutton
and watches as the telescope automatically slews to the object and places it in the
field of view. Autostar moves the telescope to automatically track (follow) the object
across the sky. Autostar brings into easy access objects that were previously unreach-
able for all but the most dedicated of amateur astronomers.
Autostar Suite with Meade LPI (Lunar Planetary Imager) and Planetarium
software (Fig. 23) turns your Meade LXD75 telescope, Autostar and PC into even
more powerful and easy-to-use astronomical instruments. See page 36 for more
details.
To find out more about these and other accessories available for your telescope,
check out the Meade General Catalog or contact your local Meade dealer.
39
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MAINTENANCE
General Maintenance
LXD75-Series telescopes are precision optical instruments designed to yield a lifetime
of rewarding applications. Given the care and respect due any precision instrument,
your LXD75 will rarely, if ever, require factory servicing. Maintenance guidelines
include:
a. Avoid cleaning the telescope’s optics: A little dust on the front surface of the tele-
scope’s correcting lens causes virtually no degradation of image quality and
should not be considered reason to clean the lens.
b. When absolutely necessary, dust on the front lens should be removed with gen-
tle strokes of a camel hair brush or blown off with an ear syringe (available at any
pharmacy). DO NOT use a commercial photographic lens cleaner.
c. Organic materials (e.g., fingerprints) on the front lens may be removed with a
solution of 3 parts distilled water to 1 part isopropyl alcohol. You may also add 1
drop of biodegradable dishwashing soap per pint of solution. Use soft, white
facial tissues and make short, gentle strokes. Change tissues often.
Caution: Do not use scented or lotioned tissues or damage could result
to the optics.
d. Do not, for any reason, remove the correcting plate from its machined hous-
ing for cleaning or other purposes. You will almost certainly not be able to
replace the corrector in its proper rotational orientation and serious degra-
dation of optical performance will result. Meade Instruments assumes no
liability for damage incurred to the telescope in this way.
e. If the LXD75 is used outdoors on a humid night, water condensation on the tele-
scope surfaces will probably result. While such condensation does not normally
cause any damage to the telescope, it is recommended that the entire telescope
be wiped down with a dry cloth before the telescope is packed away. Do not,
however, wipe any of the optical surfaces. Rather, simply allow the telescope to
sit for some time in the warm indoor air, so that the wet optical surfaces can dry
unattended.
f. If your LXD75 is not to be used for an extended period, perhaps for one month or
more, it is advisable to remove the batteries from the telescope. Batteries left in
the telescope for prolonged periods may leak, causing damage to the telescope’s
electronic circuitry.
g. Do not leave your LXD75 inside a sealed car on a warm summer day; excessive
ambient temperatures can damage the telescope’s internal lubrication and elec-
tronic circuitry.
Alignment (Collimation) of the Schmidt-Newtonian Optical
System
All Meade Schmidt-Newtonian telescopes are precisely collimated at the factory
before packing and shipment, and it is probable that you will not need to make any
optical adjustments before making observations. However, if the telescope sustained
rough handling in shipment, you may need to re-collimate the optical system. Such
re-collimation is not a difficult procedure in any case.
Note: It is not necessary
for the user to collimate the
refractor models.
SC-8 Schmidt-Cassegrain
users see ALIGNMENT OF
THE SCHMIDT-CASSEGRAIN
OPTICAL SYSTEM, page 42.
Newtonian Reflector users
see ALIGNMENT OF THE
NEWTONIAN REFLECTOR
OPTICAL SYSTEM, page 44.
The collimation procedure for the Meade Schmidt-Newtonians is slightly different from
that of other Newtonian reflecting telescopes, because of the "fast" f/4 to f/5 focal ratio
of the primary mirror. In typical Newtonian reflectors with more conventional focal
ratios (i.e. longer focal ratios), when the observer looks down the focuser tube (with-
out an eyepiece in the focuser), the images of the diagonal mirror, primary mirror,
focuser tube, and the observer's eye appear centered relative to each other. However,
with the short focal ratio primary mirror of the Schmidt-Newtonian, correct collimation
requires that the diagonal mirror be offset in 2 directions: (1) away from the focuser
and (2) towards the primary mirror, in equal amounts. This offset is approximately 1/8"
in each direction. Note that these offsets have been performed at the factory prior to
40
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b
c
d
Focuser drawtube
Diagonal mirror
Reflection of primary
mirror
Tip:
A useful tool for making
collimation easier is to make
a hole in the plastic cap that
comes with the eyepiece to
protect it during shipping.
Use a drill to make a 1/8"
hole in the center of the cap
and place it over the eye-
piece holder for use during
the collimation procedure.
e
Reflection of secondary
mirror (darkened due to
back lighting)
f
g
Primary mirror clips
Reflection of observer's eye
b c d e
f g
Fig. 31a: The view you will see while collimating a Schmidt-Newtonian telescope.
shipment of your telescope. It is only necessary for you to confirm that the telescope
has not been badly jarred out of collimation, and to perform the final fine-tuning of Step
4, below.
Fig. 31a shows a correctly collimated Schmidt-Newtonian telescope, as it appears
when viewed through the focuser with the eyepiece removed.
To check and, if necessary, set the optical collimation, follow these steps.
1. Observe through the focuser and orient your body so that the telescope's primary
mirror is to your right, and the correcting plate end of the telescope tube is to your left.
The diagonal mirror will appear centered as shown (2, Fig. 31a). If the diagonal
appears off center, then adjust the 4 collimation screws on the plastic diagonal mirror
housing.
Fig. 31b: The four collimation screws
on the diagonal mirror housing.
2. If the reflection of the primary mirror (3, Fig. 31a) is not centered on the surface of
the diagonal mirror, adjust the 4 collimation screws on the plastic diagonal mirror
housing to center the reflection.
As described above, the 4 collimation screws (Fig. 31b) on the plastic diagonal mirror
housing are used for two different adjustments during the collimation procedure.
knurled knob
thumb screw
Important Note: Do not force the 4 screws past their normal travel, and
do not rotate any screw or screws more than 2 full turns in a counter-
clockwise direction (i.e., not more than 2 full turns in their "loosening"
direction), or else the diagonal mirror may become loosened from its
support. Note that the diagonal mirror collimation adjustments are very
sensitive: generally turning a collimation screw 1/2-turn will have a dra-
matic effect on collimation.
3. If the reflection of the diagonal mirror is not centered within the reflection of the pri-
mary mirror, adjust the 3 collimation screws located on the rear of the primary mirror
cell.
Fig. 31c: The six collimation screws
on the rear of the primary mirror cell.
Note: There are 6 screws (Fig. 31c) on the primary mirror cell. The 3
knurled knobs are the collimation screws, and the 3 smaller thumb screws
are locking screws. The locking screws must be loosened slightly in order
to adjust the collimation screws.
Proceed by "trial and error" until you develop a feel for which collimation screw to turn
in order to change the image in any given way.
41
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b
c
Fig. 32: Correct (1) and incorrect (2) collimation as viewed during a star test.
4. Perform an actual star test to confirm the accuracy of steps 1 through 3. Using the
SP 26mm eyepiece, point the telescope at a moderately bright (second or third mag-
nitude) star, and center the image in the main telescope's field of view.
Note: A small paper ring is
attached to the primary mir-
ror. This ring was attached
at the factory for purposes
of laser collimation. The ring
will not diminish your tele-
scope's imaging capabilities
and does not need to be
removed.
5. Bring the star's image slowly in and out of focus until you see several disks sur-
rounding the star's center. If steps 1 through 3 were done correctly, you will see con-
centric (centered with respect to each other) circles (1, Fig. 32).
An improperly collimated instrument will reveal oblong or elongated circles (2, Fig.
32). Adjust the 3 collimating screws on the primary mirror housing until the circles
are concentric on either side of the focus.
In summary, the 4 adjustment screws on the plastic diagonal mirror housing change
the tilt of the secondary mirror so that it is correctly centered in the focuser draw-
tube, and so that the primary mirror appears centered when looking into the focuser.
The 3 collimating knobs on the primary mirror change the tilt of the primary mirror
so that it reflects the light directly up the center of the drawtube.
Alignment (Collimation) of the Schmidt-Cassegrain Optical
System
The optical collimation (alignment) of any astronomical telescope used for serious
purposes is important, but in the case of the Schmidt-Cassegrain design of the model
SC-8, such collimation is absolutely essential for good performance. Take special care
to read and understand this section well so that your model SC-8 will give you the best
optical performance.
As part of final optical testing, every Meade Schmidt-Cassegrain is precisely colli-
mated at the Meade factory before shipment. However, vibrations in shipping can
cause the optical system to become misaligned. Re-aligning the optics is, however, a
straightforward process.
To check the collimation of your SC-8, center a bright star that is overhead, or use a
“hot spot” of reflected Sunlight from a chrome car bumper, with the supplied 26mm
eyepiece. Allow the telescope to adjust to the temperature of your observation site
before proceeding; temperature differences between the optics and the outside air
can cause distortion in the images.
With the star or hot spot centered, de-focus the image. You will notice that the out of
focus star image looks like a ring of light surrounding a dark central spot; the dark cen-
tral spot is in fact the shadow of the secondary mirror. Turn the focus knob until the
ring of light fills about 10% of the eyepiece field-diameter. If the dark central spot is
offset in (i.e., not concentric with) the ring of light, your telescope’s optical system is
misaligned and requires collimation.
Follow these steps for collimation of the optical system:
a. The only adjustments possible, or necessary, on the SC-8 models are from the
three screws (Fig. 33b) located at the edge of the outer surface of the secondary
mirror housing.
42
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1
2
3
Fig. 33a: Defocused star images. Misaligned (1, 2), Aligned
Fig. 33b: Collimation screws.
Caution: Do not force the three collimation
screws past their normal travel and do not loosen them more than two full
turns in a counterclockwise direction or the secondary mirror may come
loose from its support.You will find that the adjustments are very sensitive,
usually requiring only one-half turn or less to produce the desired result.
b. While looking at the defocused star image, notice which direction the darker shad-
ow is offset in the ring of light or notice which part of the ring is the thinnest (1,
Fig. 33a). Place your index finger in front of the telescope so that it touches one
of the collimation set screws. You will see the shadow of your finger in the ring of
light. Move your finger around the edge of the black plastic secondary mirror sup-
port until you see the shadow of the finger crossing the thinnest part of the ring of
light. At this point, look at the front of the telescope where your finger is aiming. It
will either be pointing directly at a set screw, or it will be between two set screws
aiming at the set screw on the far side of the black plastic secondary mirror sup-
port. This is the set screw that you will adjust.
c. Using the Autostar's Arrow keys at the slowest slew speed, move the defocused
image to the edge of the eyepiece field of view (2, Fig. 33a), in the same direc-
tion as the darker shadow is offset in the ring of light.
d. Turn the set screw that you found with the pointing exercise while looking in the
eyepiece. You will notice that the star image will move across the field. If while
turning the defocused star image flies out of the eyepiece field, then you are turn-
ing the screw the wrong way. Turn the opposite direction and bring the image
back to the center of the field.
e. If the screw you are turning becomes very loose, tighten the other two screws by
even amounts. If the screw you are turning gets too tight, unthread the other two
by even amounts.
f. When you bring the image to center (3, Fig. 33a), carefully examine the evenness
of the ring of light (concentricity). If you find that the dark center is still off in the
same direction, continue to make the adjustment in the original turning direction.
If it is now off in the opposite direction, you have turned too far and you need to
turn in the opposite direction. Always double check the image in the center of the
field of the eyepiece.
g. You may find after your initial adjustment that the dark center is off in a new direc-
tion (e.g., instead of being off side-to-side it is now off in an up-and-down direc-
tion). In this case repeat steps b through f to find the new adjustment screw.
h. Now try a higher power eyepiece (e.g., 9mm or less) and repeat the above tests.
Any lack of collimation at this point will require only very slight adjustments of the
three set screws. You now have good collimation of the optics.
i.
As a final check of alignment, examine the star image in focus with the higher
power eyepiece as suggested (j), under good viewing conditions. The star point
should appear as a small central dot (commonly referred to as an “Airy disc”) with
a diffraction ring surrounding it. To give a final precision collimation, make
extremely slight adjustments of the three set screws, if necessary, to center the
Airy disc in the diffraction ring. You now have the best alignment of the optics pos-
sible with this telescope.
43
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Alignment (Collimation) of the Newtonian Reflector Optical
System
The optical systems of Newtonian Reflector telescopes include the following parts: pri-
mary mirror (1, Fig. 34); secondary mirror (2, Fig. 34); secondary mirror-holder (3, Fig.
34); secondary mirror-vanes (4, Fig. 34) and (1, Fig. 35); primary mirror-tilt screws (5,
Fig. 34). The telescope’s image is brought to a focus at (6, Fig. 34).
1. Confirm alignment - To confirm optical alignment look down the focuser draw-
tube (1, Fig. 37) with the eyepiece removed. The edge of the focuser drawtube
frames reflections of the primary mirror (2, Fig. 37), the secondary mirror (3, Fig.
37), the three (“spider”) vanes (4, Fig. 37) holding the secondary mirror, and the
observer’s eye (5, Fig. 37). With the optics properly aligned, all of these reflec-
tions appear concentric (centered), as shown in Fig. 37. Any deviation from con-
centricity of any of these telescope parts with the eye requires adjustments to the
secondary mirror-holder (Fig. 35) and/or the primary mirror cell (Fig. 36, as
described below.
2. Secondary mirror-vane adjustments: If the secondary mirror (1, Fig. 38) is left or
right of center within the drawtube (2, Fig. 38), slightly loosen the 3-vane adjust-
ment/lock knobs (1, Fig. 35) located on the outside surface of the main tube and slide
the entire secondary mirror-holder system up or down in the slotted holes of the main
tube until the secondary mirror is centered in the drawtube. If the secondary mirror (1,
Fig. 38) is above- or below-center within the drawtube, thread inward one of the adjust-
ment/lock knobs (1, Fig. 35) while unthreading another of these knobs. Only make
adjustments to two knobs at a time until the secondary mirror appears as in Fig. 39.
3. Secondary mirror-holder adjustments: If the secondary mirror (1, Fig. 39) is cen-
tered in the focuser drawtube (2, Fig. 39), but the primary mirror is only partially vis-
ible in the reflection (3, Fig. 39), the three “+” (Phillips head) secondary mirror-tilt
screws (2, Fig. 35) should be slightly unthreaded to the point where the secondary
mirror-holder (3, Fig. 35) can rotate about its axis parallel to the main tube. Grasp the
secondary mirror-holder (avoid touching the mirror surface!) with your hand and
rotate it until, looking through the drawtube, you can see the primary mirror centered
as well as possible in the reflection of the secondary mirror. With the rotation of the
secondary mirror-holder at this best-possible position, thread in the three Phillips
head screws (2, Fig. 35) to lock the rotational position. Then, if necessary, make
adjustments to these three Phillips head screws to refine the tilt-angle of the second-
ary mirror, until the entire primary mirror can be seen centered within the secondary
mirror’s reflection. With the secondary mirror thus aligned the image through the
drawtube appears as in Fig. 40.
4. Primary mirror adjustments: If the secondary mirror (1, Fig. 40) and the reflection
of the primary mirror (2, Fig. 40) appear centered within the drawtube (3, Fig. 40), but
the reflection of your eye and the reflection of the secondary mirror (4, Fig. 40) appear
off-center, then the primary mirror tilt requires adjusting, using the Phillips head
screws of the primary mirror cell (3, Fig. 36). These primary mirror-tilt screws are
located behind the primary mirror, at the lower end of the main tube. See Fig. 36.
Before adjusting the primary mirror-tilt screws, first unscrew by several turns (use
either a hex wrench or pliers) the three hex-head primary mirror lock screws (2, Fig.
36) which are also located on the rear surface of the primary mirror cell and which
alternate around the cell’s circumference with the three Phillips head screws. Then by
trial and error turn the primary mirror Phillips head tilt screws (3, Fig. 36) until you
develop a feel for which way to turn each screw to center the reflection of your eye in
the drawtube. (An assistant is helpful in this operation.) With your eye centered as
shown in Fig. 37, turn the three hex head primary mirror lock screws (2, Fig. 36) to
re-lock the tilt-angle of the primary mirror.
The telescope’s optical system is now aligned, or collimated. This collimation should
be re-checked from time to time, with small adjustments (per steps 1, 2, and/or 3,
above) effected as required to keep the optics well-aligned.
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4
3
5
1
2
6
Fig. 34
3
2
2
1
2
3
Fig. 36.
Fig. 35.
1
2
2
3
4
1
5
Fig. 37.
Fig. 38.
1
1
2
4
2
3
3
Fig. 39.
Fig. 40.
45
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SPECIFICATIONS
6" f/5 Model SN-6AT, SN-6EC Specifications
Optical design..............................................Schmidt-Newtonian
Clear aperture..............................................6" (152mm)
Focal length ................................................762mm
Focal ratio (photographic speed) ................f/5
Resolving power ..........................................0.74 arc secs
Coatings ......................................................Meade EMC Super Multi-Coatings
Ultra-High Transmission Coating optional
Mounting......................................................Die-cast aluminum
Input Voltage ..............................................12v DC
Alignment ....................................................German-type equatorial mount
Slew Speeds................................................SN-8: 1x sidereal to 4.5°/sec
in 9 increments
SN-8EC: 2x sidereal to 4.5°/sec
in 4 increments
Tripod ..........................................................Variable-height field tripod
Accessories ................................................8 x 50mm finder
T-Adapter
Super Plössl 26mm eyepiece
1.25" and 2" eyepiece holders
Battery pack for 8 D-cell batteries
(user-supplied)
SN-6: Autostar Controller
SN-6EC: Electronic Controller
Polar Finder Reticle Batteries......................Maxell LR41 or equivalent
Net telescope weight ..................................13 lbs.
Net tripod weight..........................................35 lbs.
8" f/4 Model SN-8AT, SN-8EC Specifications
Optical design..............................................Schmidt-Newtonian
Clear aperture..............................................8" (203mm)
Focal length ................................................812mm
Focal ratio (photographic speed) ................f/4
Resolving power ..........................................0.56 arc secs
Coatings ......................................................Meade EMC Super Multi-Coatings
Ultra-High Transmission Coating optional
Mounting......................................................Die-cast aluminum
Input Voltage ..............................................12v DC
Alignment ....................................................German-type equatorial mount
Slew Speeds................................................SN-8: 1x sidereal to 4.5°/sec
in 9 increments
SN-8EC: 2x sidereal to 4.5°/sec
in 4 increments
Tripod ..........................................................Variable-height field tripod
Accessories ................................................8 x 50mm finder
T-Adapter
Super Plössl 26mm eyepiece
1.25" and 2" eyepiece holders
Battery pack for 8 D-cell batteries
(user-supplied)
SN-8: Autostar Controller
SN-8EC: Electronic Controller
Polar Finder Reticle Batteries......................Maxell LR41 or equivalent
Net telescope weight ..................................24 lbs.
Net tripod weight..........................................45 lbs.
46
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10" f/4 Model SN-10AT Specifications
Optical design..............................................Schmidt-Newtonian
Clear aperture..............................................10" (254mm)
Focal length ................................................1016mm
Focal ratio (photographic speed) ................f/4
Resolving power ..........................................0.45 arc secs
Coatings ......................................................Meade EMC Super Multi-Coatings
Ultra-High Transmission Coating optional
Mounting......................................................Die-cast aluminum
Input Voltage ..............................................12v DC
Alignment ....................................................German-type equatorial mount
Slew Speeds................................................1x sidereal to 4.5°/sec in 9 increments
Tripod ..........................................................Variable-height field tripod
Accessories ................................................8 x 50mm finder
T-Adapter
Super Plössl 26mm eyepiece
1.25" and 2" eyepiece holders
Battery pack for 8 D-cell batteries
(user-supplied)
Autostar Controller
Polar Finder Reticle Batteries......................Maxell LR41 or equivalent
Net telescope weight ..................................30 lbs.
Net tripod weight..........................................55 lbs.
5" f/9.3 Model AR-5AT, AR-5EC Specifications
Optical design..............................................Achromatic Refractor
Clear aperture..............................................5" (127mm)
Focal length ................................................1180mm
Focal ratio (photographic speed) ................f/9.3
Resolving power ..........................................0.90 arc secs
Coatings ......................................................Meade EMC Super Multi-Coatings
Mounting......................................................Die-cast aluminum
Input Voltage ..............................................12v DC
Alignment ....................................................German-type equatorial mount
Slew Speeds................................................SN-8: 1x sidereal to 4.5°/sec
in 9 increments
SN-8EC: 2x sidereal to 4.5°/sec
in 4 increments
Tripod ..........................................................Variable-height field tripod
Accessories ................................................8 x 50mm finder
1.25" diagonal
Super Plössl 26mm eyepiece
1.25" and 2" eyepiece holders
Battery pack for 8 D-cell batteries
(user-supplied)
AR-5: Autostar Controller
AR-5EC: Electronic Controller
Polar Finder Reticle Batteries......................Maxell LR41 or equivalent
Net telescope weight ..................................15 lbs.
Net tripod weight..........................................35 lbs.
6" f/8 Model AR-6AT Specifications
Optical design..............................................Achromatic Refractor
Clear aperture..............................................6" (152mm)
Focal length ................................................1200mm
Focal ratio (photographic speed) ................f/8
Resolving power ..........................................0.74 arc secs
Coatings ......................................................Meade EMC Super Multi-Coatings
Mounting......................................................Die-cast aluminum
Input Voltage ..............................................12v DC
47
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Alignment ....................................................German-type equatorial mount
Slew Speeds................................................1x sidereal to 4.5°/sec in 9 increments
Tripod ..........................................................Variable-height field tripod
Accessories ................................................8 x 50mm finder
1.25" diagonal
Super Plössl 26mm eyepiece
1.25" and 2" eyepiece holders
Battery pack for 8 D-cell batteries
(user-supplied)
Autostar Controller
Polar Finder Reticle Batteries......................Maxell LR41 or equivalent
Net telescope weight ..................................27 lbs.
Net tripod weight..........................................45 lbs.
8" f/10 Model SC-8AT Specifications
Optical design..............................................Schmidt-Cassegrain
Clear aperture..............................................8" (203mm)
Focal length ................................................2000mm
Focal ratio (photographic speed) ................f/10
Resolving power ..........................................0.56 arc secs
Coatings ......................................................Meade EMC Super Multi-Coatings
Ultra-High Transmission Coating optional
Mounting......................................................Die-cast aluminum
Input Voltage ..............................................12v DC
Alignment ....................................................German-type equatorial mount
Slew Speeds................................................1x sidereal to 4.5°/sec in 9 increments
Tripod ..........................................................Variable-height field tripod
Accessories ................................................8 x 50mm finder
1.25" diagonal
Super Plössl 26mm eyepiece
1.25" and 2" eyepiece holders
Battery pack for 8 D-cell batteries
(user-supplied)
Autostar Controller
Polar Finder Reticle Batteries......................Maxell LR41 or equivalent
Net telescope weight ..................................24 lbs.
Net tripod weight..........................................45 lbs.
6" f/5 Model N-6EC Specifications
Optical design..............................................Newtonian Reflector
Clear aperture..............................................6" (152mm)
Focal length ................................................762mm
Focal ratio (photographic speed) ................f/5
Resolving power ..........................................0.74 arc secs
Coatings ......................................................Meade EMC Super Multi-Coatings
Ultra-High Transmission Coating optional
Mounting......................................................Die-cast aluminum
Input Voltage ..............................................12v DC
Alignment ....................................................German-type equatorial mount
Slew Speeds................................................1x sidereal to 4.5°/sec in 9 increments
Tripod ..........................................................Variable-height field tripod
Accessories ................................................6 x 30mm finder
1.25" diagonal
Super Plössl 26mm eyepiece
1.25" and 2" eyepiece holders
Battery pack for 8 D-cell batteries
(user-supplied)
Autostar Controller
Polar Finder Reticle Batteries......................Maxell LR41 or equivalent
Net telescope weight ..................................26 lbs.
Net tripod weight..........................................45 lbs.
48
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Autostar Specifications
Processor ............................................................................68HC11, 8MHz
Flash Memory ............................................................1.0MB, reloadable
Keypad........................................................................20 key alphanumeric
Display ........................................................................2 line, 16 character LCD
Backlight......................................................................Red LED
Utility Light ..................................................................Yes
Coil Cord ....................................................................24"
Database ....................................................................30,223 objects
Autostar Dimensions
Length ........................................................................6.56" (16.6cm)
Width (LCD end) ........................................................3.19" (80cm)
Width (Connector end)................................................2.25" (57cm)
Depth ..........................................................................0.81" (21cm)
Autostar net weight ....................................................1.12 lbs (0.51kg)
Maxell is a trademark of Hitachi Maxell, Ltd.
Inspecting the Optics
A Note About the Flashlight Test: If a flashlight or other high-intensity light source is
pointed down the main telescope tube, the view (depending upon the observer’s line
of sight and the angle of the light) may reveal what appears to be scratches, dark or
bright spots, or just generally uneven coatings, giving the appearance of poor quality
optics. These items are only seen when a high intensity light is transmitted through
lenses or reflected off the mirrors, and can be seen on any high quality optical system,
including giant research telescopes.
The optical quality of a telescope cannot be judged by the “flashlight test;" the true test
of optical quality can only be conducted through careful star testing.
Meade Customer Service
If you have a question concerning your LXD75-Series telescope, contact the Meade
Instruments Customer Service Department at:
Telephone: (949) 451-1450
Customer Service hours are 7:00 AM to 6:00 PM, Pacific Time, Monday through
Friday. In the unlikely event that your LXD75-Series telescope requires factory servic-
ing or repairs, write or call the Meade Customer Service Department first, before
returning the telescope to the factory, giving full particulars as to the nature of the
problem, as well as your name, address, and daytime telephone number. The great
majority of servicing issues can be resolved by telephone, avoiding return of the tele-
scope to the factory. If factory service is required, you will be assigned a Return Goods
Authorization (RGA) number prior to return.
49
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APPENDIX A: CELESTIAL
COORDINATES
A celestial coordinate system was created that maps an imaginary sphere surround-
ing the Earth upon which all stars appear to be placed. This mapping system is simi-
lar to the system of latitude and longitude on Earth surface maps.
In mapping the surface of the Earth, lines of longitude are drawn between the North
and South Poles and lines of latitude are drawn in an East-West direction, parallel to
the Earth’s equator. Similarly, imaginary lines have been drawn to form a latitude and
longitude grid for the celestial sphere. These lines are known as Right Ascension
and Declination.
The celestial map also contains two poles and an equator just like a map of the Earth.
The poles of this coordinate system are defined as those two points where the Earth’s
north and south poles (i.e., the Earth's axis), if extended to infinity, would cross the
celestial sphere. Thus, the North Celestial Pole (1, Fig. 41) is that point in the sky
where an extension of the North Pole intersects the celestial sphere. The North Star,
Polaris is located very near the North Celestial Pole. The celestial equator (2, Fig. 41)
is a projection of the Earth’s equator onto the celestial sphere.
Just as an object's position on the Earth’s surface can be located by its latitude and
longitude, celestial objects may also be located using Right Ascension and
Declination. For example, you could locate Los Angeles, California, by its latitude
(+34°) and longitude (118°). Similarly, you could locate the Ring Nebula (M57) by its
Right Ascension (18hr) and its Declination (+33°).
I
Right Ascension (R.A.): This celestial version of longitude is measured in units
of hours (hr), minutes (min), and seconds (sec) on a 24-hour "clock" (similar to
how Earth's time zones are determined by longitude lines). The "zero" line was
arbitrarily chosen to pass through the constellation Pegasus — a sort of cosmic
Greenwich meridian. R.A. coordinates range from 0hr 0min 0sec to 23hr 59min
59sec. There are 24 primary lines of R.A., located at 15-degree intervals along
the celestial equator. Objects located further and further East of the zero R.A. grid
line (0hr 0min 0sec) carry higher R.A. coordinates.
North
Celestial
Pole
(Vicinity
of Polaris)
+90 Dec.
Star
I
Declination (Dec.): This celestial version of latitude is measured in degrees, arc-
minutes, and arc-seconds (e.g., 15° 27' 33"). Dec. locations north of the celestial
equator are indicated with a plus (+) sign (e.g., the Dec. of the North celestial pole
is +90°). Dec. locations south of the celestial equator are indicated with a minus
(–) sign (e.g., the Dec. of the South celestial pole is –90°). Any point on the celes-
tial equator (such as the the constellations of Orion, Virgo, and Aquarius) is said
to have a Declination of zero, shown as 0° 0' 0."
1
12
11
1
13
10
2
14
15
9
8
16
17
7
Earth’s
Rotation
18
6
5
19
4
3
20
Celestial
Equator
21
22
23
0
Right Ascension
0 Dec.
2
South
Celestial
Pole
-90 Dec.
Setting Circles
Setting circles included with the LXD75-Series models permit the location of faint celes-
tial objects not easily found by direct visual observation. With the telescope pointed at
the North Celestial Pole, the Dec. circle (19, Fig. 1d) should read 90° (understood to
mean +90°). Each division of the Dec. circle represents a 1° increment. The R.A. cir-
cle (31, Fig. 1d) runs from 0hr to (but not including) 24hr, and reads in increments of
5min.
Fig. 41: Celestial Sphere.
Using setting circles requires a developed technique. When using the circles for the
first time, try hopping from one bright star (the calibration star) to another bright star
of known coordinates. Practice moving the telescope from one easy-to-find object to
another. In this way, the precision required for accurate object location becomes evi-
dent.
Note You may also enter an object's R.A. and Dec. coordinates using the
"User: Objects" option of Autostar's Object menu. Autostar then automat-
ically slews the telescope to the entered coordinates.
To use the setting circles to locate an object not easily found by direct visual
observation:
Insert a low-power eyepiece, such as a 26mm, into the focuser assembly. Pick out a
bright star with which you are familiar (or is easily located) that is in the area of the
sky in which your target object is located. Look up the R.A. coordinate of the bright
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star, and also of the object you wish to locate, in a star atlas. Point the object at the
bright star. Then loosen the R.A. setting circle lock knob (32, Fig. 1d) and turn the
R.A. setting circle to read the correct R.A. coordinate of the bright star; lock the R.A.
setting circle lock knob onto the object. Next, loosen the R.A. lock (33, Fig. 1d) and
turn the telescope in R.A. to read the correct R.A. coordinate of the object. Tighten the
R.A. lock (33, Fig. 1d). If the procedure has been followed carefully, the desired object
should now be in the telescopic field of a low-power eyepiece.
If you do not immediately see the object you are seeking, try searching the adjacent
sky area. Keep in mind that, with the 26mm eyepiece, the field of view of the LXD75-
Series is about 0.5°. Because of its much wider field, the viewfinder may be of signif-
icant assistance in locating and centering objects, after the setting circles have been
used to locate the approximate position of the object.
See USING AUTOSTAR TO FIND OBJECTS NOT IN THE LIBRARIES, page 33, for infor-
mation on how to manually enter coordinates into Autostar.
Locating the Celestial Pole
To get basic bearings at an observing location, take note of where the Sun rises (East)
and sets (West) each day. After the site is dark, face North by pointing your left shoul-
der toward where the Sun set. To precisely point at the pole, find the North Star
(Polaris) by using the Big Dipper as a guide (Fig. 42).
Little Dipper
Polaris
Big Dipper
Cassiopeia
Polar Alignment
Autostar provides several different methods of Polar Alignment: Easy, One-Star, Two-
Star and Three-Star. See EASY ALIGNMENT, page 21, and THREE-STAR ALIGNMENT
USING AUTOSTAR, page 52, for those procedure.
Fig. 42 Locating Polaris.
One-Star Polar Alignment
Polar One-Star Alignment requires some knowledge of the night sky. Autostar pro-
vides a library of bright stars and one star from this library is chosen by the observer
for alignment. Polaris is chosen by Autostar. The rest of the procedure is almost iden-
tical to the EASY ALIGNMENT, page 21, except that Autostar prompts you to point the
telescope at Polaris and center it in the telescope's eyepiece.
Two-Star Polar Alignment
Polar Two-Star Alignment requires some knowledge of the night sky. Autostar pro-
vides a library of bright stars and two stars from this library are chosen by the observ-
er for alignment. Polaris is chosen by Autostar. The rest of the procedure is almost
identical to the EASY ALIGNMENT, page 21, except that Autostar prompts you to point
the telescope at Polaris and center it in the telescope's eyepiece.
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APPENDIX B: ENHANCING
Reticle LED Knob
POINTING PRECISION
The Polar Alignment Viewfinder
Typically Autostar's pointing capabilities are sufficient for most telescope observers,
and the use of the polar alignment viewfinder is unnecessary for them. However, for
those observers who need to meet the more demanding requirements of astropho-
tography, the polar alignment viewfinder allows the telescope mount to be more pre-
cisely aligned with true North. The polar alignment viewfinder contains a reticle, lit by
an LED (Figs. 43 and 44).
Eyepiece
To align your telescope to North using the polar alignment viewfinder:
Fig. 43: The polar alignment
viewfinder.
1. Set your telescope in the home position (see page 17). Then loosen the Dec.
lock (17, Fig. 1d) and rotate the optical tube 90°. Re-tighten the Dec. Lock.
2. Loosen the R.A. Lock (33, Fig. 1d).
3. Remove the polar viewfinder cap (18, Fig. 1d).
4. If you have not already done so, remove the plastic separating the watch batter-
ies inside the polar alignment reticle. See step 12, page 13.
5. Turn the polar alignment reticle LED knob to turn on the LED and look through
the reticle.
6. Northern Hemisphere: Move the telescope mount until Polaris is superimposed
on the graduated area of the reticle (between 40' and 60'). The center crosshair
denotes the North celestial pole. Southern Hemisphere: The four-sided figure in
the reticle represents a grouping of four stars in Octantis (Sigma, Tau, Chi, and
Upsilon) for use in the Southern Hemisphere. Move the telescope mount on its
R.A. axis until the four stars depicted in the reticle are superimposed on the four
star group that matches the reticle pattern.
7. Use the latitude T-handle screws (26, Fig. 1d) and the fine azimuth control knobs
(27, Fig. 1d) to fine tune the mount adjustment until the reticle pattern is more
precisely superimposed over the appropriate position as described in step 6.
Fig. 44: The view inside the polar
alignment viewfinder reticle.
Note: Not all pointing positions are possible with the polar alignment reticle,
as the tripod is a limiting factor as to how far the optical tube and mount can
be moved.
8. Tighten the R.A. Lock (33, Fig. 1d). Return the optical tube to the home position.
Note: Remember to turn off the polar alignment reticle LED.
Enhancement Methods
Autostar provides four methods of enhancing your telescope’s pointing precision:
#1: Three-Star Alignment, #2: Axis Alignment #3: Axis Alignment with Autostar and
#4: Smart Drive Training (Periodic Error Correction).
Method #1 is recommended for all users, but especially for the beginner and Methods
#2, #3 and #4 are recommended for the Advanced observer.
Method #1:Three-Star Alignment Using Autostar
Perform this procedure at night. This method is similar to Two-Star Alignment (see
page 51), but in this method, Autostar chooses three stars to align upon: Two stars
on one side of the sky and a third star on the opposite side of the sky.
In order to get the most out of this procedure, make sure you perform the Train the
Drive procedure (see page 20). The combination of Training your Drive and perform-
ing Three-Star Alignment will optimize your pointing accuracy.
To perform the Three-Star Alignment:
1. Keep pressing MODE until "Select Item: Setup" is displayed. Press ENTER.
2. "Setup: Align" displays. Press ENTER. "Align: Easy" displays. Press the Scroll
Down key until “Align: Three-Star” displays. Press ENTER.
3. "German North" displays and a scrolling message prompts you to set your
telescope in the polar home position. See SETTING THE POLAR HOME POSITION,
page 17, for a description of this procedure. Press ENTER after you finish the
procedure.
52
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4. Autostar then chooses three stars from its database to align upon. When the
telescope slews to a star for alignment, it may not appear in the field of view in the
eyepiece. Use the Arrow keys to move the telescope until the star is visible and
centered in the eyepiece. The alignment star should be easily recognized and be
the brightest star in the area of the sky where the telescope is pointing. See WHICH
ONE'S THE ALIGNMENT STAR, page 18, for more information. When the star is
centered, press ENTER. Repeat the procedure for the second and third alignment
stars.
Note: Autostar locates alignment stars based on the date, time, and
location entered. The alignment stars may change from night to night. All
that is required is for the observer to center the selected star in the
eyepiece when prompted.
Method 2: Axis Alignment Procedures
In order for the equatorial mount to accurately point to astronomical objects using the
GO TO feature of the Autostar handbox, the optical axis of the optical tube must be
aligned with the R.A. axis of the mount. In most cases, the telescope will perform ade-
quately without making any adjustments, but performing one of the following align-
ment methods before the initial use of the telescope, and periodically thereafter, will
increase the mount’s pointing accuracy.
When the optical axis is perfectly aligned to the R.A. axis and the declination set to 90°,
all objects will rotate about a point in the center of the eyepiece, as the mount is rotated
about the R.A. axis. A misalignment in elevation results in the center of rotation shifting
up or down. A misalignment in attitude results in the center shifting left or right.
The telescope is moved manually in Method #1 to correct for attitude misalignment
and then for elevation misalignment. Autostar moves the telescope in Method #2.
Procedure #1:To correct for attitude misalignment
Ạ
Important Note: Throughout the following procedures, the directional refer-
ences up/down/left/right are used. No matter which type of telescope model
you are using, these directions are to be interpreted relative to real-world tar-
gets. For example, left/right moves the image along the horizon, and
up/down moves the image vertically.
Perform this procedure during the daytime. You will need to have a clear line of sight
to a wide, distinct landmark with a clear, horizontal feature.
1. Plug in Autostar and turn on the power as described previously in this manual.
You will use Autostar's Arrow keys in the course of this procedure.
2. Loosen the R.A. Lock (33, Fig. 1d) and the Dec. Lock (17, Fig. 1d). Point the tube
so that the tripod leg below the Fine Azimuth Control Knobs (27, Fig. 1c) approx-
imately faces North (or South in the Southern Hemisphere). Retighten the Dec.
Lock. Move the counterweight shaft and mount so that it is parallel to the horizon.
This is position A. See Fig. 45. Retighten the R.A. Lock.
ạ
Fig. 44: A. Elevation Alignment;
B. Attitude Alignment.
3. If using a Schmidt Newtonian model, rotate the optical tube (you will need to
loosen the cradle ring lock knobs (13, Fig. 1a) to do so) to make sure the focuser
extends horizontally from the optical tube while in position A and do not rotate the
tube for the remainder of the alignment procedure.
If using a refractor model, use the diagonal assembly to rotate the eyepiece
during testing. However, be careful that the diagonal is placed flush against the
focuser and tightened in place using the thumbscrews. It is important that the
diagonal does not slip during the procedure.
4. Adjust the tripod legs, polar axis altitude and/or polar axis azimuth so that the
wide, horizontal object you have chosen as a target is positioned across the mid-
dle of the eyepiece.
Procedure #1: Step 4
Step 5
Step 6
Step 7
53
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Important Note: The image will appear right-side-up, but reversed left-for-
right, in the eyepiece of a refractor telescope. The image will appear
upside-down, but correct left-for-right, in the eyepiece of a Schmidt-
Newtonian telescope, if the eyepiece extends horizontally from the tube, as
described in Step #3.
5. Loosen the R.A. Lock (Tip: Make sure you do not accidentally loosen the Dec.
Lock. If you do, restart the procedure beginning at Step #2). Rotate the telescope
180° in the R.A. axis ONLY, until the optical tube is in position B. See Fig. 46.
Note the position of your target in the eyepiece.
6. Using the Autostar Up and Down Arrow keys ONLY, move the optical tube in Dec.
axis until your target is HALFWAY back to the center of the eyepiece.
7. Rotate the telescope 180° in the R.A. axis ONLY, to return the optical tube to posi-
tion A. Verify that your target is in the same location in the eyepiece vertically as
in the previous step (that is, it is not higher or lower or absent from the eyepiece).
Ignore side-to-side misalignment (that is, if it has moved to the right or left).
Fig. 45: Position A.
8. Repeat steps 6 and 7, if necessary, alternating positions A and B, until the hori-
zontal object is in the same vertical location in the eyepiece in both positions.
9. The Dec. optical axis is now calibrated to be at 90 degrees. For Procedure #2,
DO NOT adjust the declination of the optical tube, either manually or with the
handbox.
Procedure #2:To correct for elevation misalignment
After performing the attitude correction, select an object that is at a very great distance
(at least a mile away) to approximate infinity. Ideally, the object should be unique, with
several identifiable objects to the left and right of it.
1. Rotate the mount about the R.A. axis only and move the optical tube to position A.
2. WITHOUT moving the declination axis from its position determined in the previ-
ous alignment, adjust the legs, latitude, and azimuth of the tripod to center the
object in the eyepiece.
Fig. 46: Position B.
Procedure #2: Step 2
Step 4
Step 5
Step 6
3. Rotate the telescope 180° in the R.A. axis ONLY, until optical tube is in position B.
4. Observe the position of the object in the eyepiece. Assuming that the declination
was properly set in the previous procedure, the object should have moved only
horizontally (that is, side-to-side) from its original position. It may be out of the
eyepiece altogether.
5. Using the adjustment mechanism on the bottom of the cradle (Fig. 47), move the
reference object approximately half the distance towards the center of the eye-
piece.
To adjust the cradle screws, use the supplied hex key to loosen the two outside
screws. Then adjust the position of the object by tightening or loosening the cen-
ter screw. Perform this adjustment on both sets of screws. When finished, retight-
en the outer screws.
Fig. 47: Cradle adjustment screws.
Before moving the optical tube, note the location that the telescope is centered
on relative to the reference object. Depending on the telescope type and acces-
sories in use, you may need to move the optical tube opposite to the direction that
appears in the eyepiece. The best way to be sure is to move the optical tube
(using the cradle screws) a little, and verify that the correct direction was moved
through the eyepiece.
6. WITHOUT moving the declination axis from its position determined in the previ-
ous alignment, and WITHOUT adjusting the cradle position further, adjust the
legs, latitude, and azimuth of the tripod to center the object in the eyepiece again.
54
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7. Rotate the telescope 180° in the R.A. axis ONLY, to return the optical tube to
position A.
8. Repeat steps 5 through 8, if necessary, alternating between position A and posi-
tion B, and bringing the reference object halfway of the remaining distance to
center. Stop the procedure once the distance between the object in position A
and position B is less than one third the width of the eyepiece.
Ạ
Ả
Motor at
back of
mount
9. As a final check, select another object and place it into the center of the eyepiece.
Rotate the mount about the R.A. axis. Watch the motion of that object. It is
acceptable if it moves slightly, but should remain in the eyepiece the entire time.
Tips
ạ
I
When moving to position A or B, it is usually sufficient to merely level the Dec.
axis by eye. Whether in position A or B, the counterweight shaft should appear to
be horizontal when looked at from several feet away.
I
If you are finding it difficult to lower the altitude of the tripod head without the
counterweight banging into the forward tripod leg, increase the length of the two
rear tripod legs to introduce a tilt into the whole mount.
ả
I
I
Before starting the alignment procedure, it is helpful to have the tripod azimuth
adjustment knobs even, to allow an equal range of travel in either direction.
Make sure the focuser lock is tightened once focus is achieved. Otherwise, grav-
ity may cause the focuser to move during rotation of the telescope and introduce
error into the procedure.
Fig. 48: Method #2 Setup. (A) Optical
Tube; (B) Dec. Motor; (C) Cradle
Ring Lock Knobs; (D) Eyepiece.
Method 3: Axis Alignment Using Autostar
Perform this procedure during the daytime. You will need to have an unobstructed
view of an easily sighted landmark, such as a light post. Use a low-power eyepiece,
such as the supplied 26mm. This procedure assumes that you have some familiarity
with Autostar's menu structure (you will need to locate the "Setup: Telescope"
menu). If necessary, refer to AUTOSTAR'S MENUS, page 25.
Note: For best result, perform this procedure after you have trained the
drive. See page 20.
1. Adjust the latitude T-handle screws (26, Fig. 1d) so that the latitude is set to
45° or higher. See Step #6, page 12, for information about setting the latitude
controls.
2. Refer to Fig. 48 while performing this step. The Dec. motor (B) must be
positioned so that it is at the back of the mount. The optical tube (A) must be
approximately horizontal (i.e., parallel with the horizon) and the counterweight
shaft must be pointing straight down.
If using a Schmidt-Newtonian model, loosen the cradle ring locks knobs (C)
and move the optical tube until the eyepiece (D) points downward as shown in
the Fig. 48. Re-tighten the cradle ring locks.
If using a refractor model, use the diagonal assembly to rotate the eyepiece
to a convenient viewing angle during testing. However, be careful that the diag-
onal is placed flush against the focuser and tightened in place using the thumb-
screws. It is important that the diagonal does not slip during the procedure.
3. Make sure that both the R.A. and Dec. locks (17 and 33, Fig. 1d) are tightened
to a firm feel.
4. Turn on Autostar and go to "Setup: Telescope." Press ENTER.
5. Press one of the Scroll keys until "LXD 55 Adjust" displays and then press
ENTER. A message displays that tells you to center a landmark. If the landmark
is not visible in your eyepiece, lift and move the entire telescope and tripod
assembly—try not to move the tube too far from the horizontal position (no
more than 5° up or down), as described in Step #2. You may also use the fine
azimuth controls (27, Fig. 1d) for side to side movement and the Autostar
Up/Down Arrows for small adjustments to the declination axis.
6. Caution: Before pressing ENTER, step back from the telescope assembly,
as the telescope will begin to rotate about two axes. When the landmark is
centered (Step #5), press ENTER.
55
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The telescope first moves 180° on the Dec. axis and then rotates 180° on the
R.A. axis. Autostar displays "Slewing....".
When the telescope has completed the 180° slew, the telescope will be under
the mount instead of over it. The counterweight shaft is now pointed upwards
and the cradle adjustment screws (Fig. 47) are easily accessible.
7. Autostar again prompts you to center the landmark you have chosen in the
eyepiece. Use the Arrow keys to center the object and then press ENTER.
8. The telescope moves again on the R.A. axis. Use the cradle screw adjustment
mechanism on the bottom of the cradle to center the landmark in the eyepiece.
To adjust the cradle screws, use the supplied hex key to loosen the two outside
screws. Then adjust the position of the landmark by tightening or loosening the
center screw. Perform this adjustment on both sets of screws. When finished,
retighten the outer screws. The axis is now aligned.
Note: This procedure maximizes the pointing accuracy of the telescope provid-
ed the telescope is always placed on the mount in the same fashion. A mark
made on the mount under the saddle will ensure this alignment is maintained.
Method #4: Smart Drive Training (Periodic Error Correction)
If you wish to improve the gear performance on your telescope, first, perform the train
the drive procedure (see page 20). Then use the Periodic Error Correction (PEC)
Train menu option to remove the slight perturbations from center that occur due to the
mechanical nature of a telescope. To perform this procedure, you need to use a high-
power reticle, such as the 9mm reticle (see OPTIONAL ACCESSORIES, page 37).
Important Note: In order for the Smart Drive training to operate and be
updated properly, you must “park” the telescope (see PARK SCOPE, page
28).
PEC Train Menu Option
To perform the procedure on the R.A. axis, pick a bright star in the South that has min-
imal movement and is about 30° above the horizon (Note: If in the Southern hemi-
sphere, pick a star in the North that is about 30° above the horizon).
Important Note: The Train option overwrites any previous PEC data.
1. Select "PEC Train" from the Smart Drive menu (in the "Setup: Telescope" menu)
and press ENTER.
2. Look through the reticle. Use the Arrow keys to keep the star centered in the reticle
cross-hairs. Autostar displays a count of the 150 positions of the worm gear. When
the count reaches 150, one cycle is complete. A full cycle takes about 12 minutes.
3. Press MODE to exit.
PEC Update Menu Option
PEC Update does not overwrite the data, but updates the training using information
gathered from both the last and the current training sessions. Press the MODE key to
exit from this option. If you wish to further refine your training, select this menu again
and repeat the procedure.
PEC Erase Menu Option
Select this option to erase all PEC training data.
56
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APPENDIX C: LATITUDE CHART
Latitude Chart for Major Cities of the World
To aid in the polar alignment procedure (see pages 17-21), latitudes of major cities around the world are listed below. To determine the lati-
tude of an observing site not listed on the chart, locate the city closest to your site. Then follow the procedure below:
Northern hemisphere observers (N): If the site is over 70 miles (110 km) north of the listed city, add one degree for every 70 miles. If the
site is over 70 miles South of the listed city, subtract one degree per 70 miles.
Southern Hemisphere observers (S): If the site is over 70 miles (110 km) north of the listed city, subtract one degree for every 70 miles. If
the site is over 70 miles South of the listed city, add one degree per 70 miles.
NORTH AMERICA
City
Albuquerque
Anchorage
Atlanta
Boston
Calgary
Chicago
Cleveland
Dallas
Denver
Detroit
Honolulu
Jackson
Kansas City
Kenosha
Las Vegas
Little Rock
Los Angeles
Mexico City
Miami
Minneapolis
Nashville
New Orleans
New York
Oklahoma City
Ottawa
Philadelphia
Phoenix
Portland
Salt Lake City
San Antonio
San Diego
San Francisco
Seattle
SOUTH AMERICA
City
State/Prov./Country Latitude
Country
Colombia
Brazil
Argentina
Uruguay
Chile
Latitude
4° N
New Mexico
Alaska
Georgia
Massachusetts
Alberta
Illinois
35° N
61° N
34° N
42° N
51° N
42° N
41° N
33° N
40° N
42° N
21° N
32° N
39° N
45° N
36° N
35° N
34° N
19° N
26° N
45° N
36° N
30° N
41° N
35° N
45° N
40° N
33° N
46° N
41° N
29° N
33° N
38° N
47° N
39° N
Bogotá
São Paulo
Buenos Aires
Montevideo
Santiago
23° S
35° S
35° S
34° S
10° N
Caracas
Venezuela
Ohio
Texas
ASIA
City
Beijing
Hong Kong
Seoul
Taipei
Tokyo
Sapporo
Bombay
Calcutta
Hanoi
Country
China
China
South Korea
Taiwan
Japan
Japan
India
India
Vietnam
Saudi Arabia
Latitude
40° N
23° N
37° N
25° N
36° N
43° N
19° N
22° N
21° N
21° N
Colorado
Michigan
Hawaii
Mississippi
Missouri
Wisconsin
Nevada
Arkansas
California
Mexico
Jedda
Florida
AFRICA
City
Cairo
Cape Town
Rabat
Tunis
Minnesota
Tennessee
Louisiana
New York
Oklahoma
Ontario
Pennsylvania
Arizona
Oregon
Utah
Texas
California
California
Washington
District of Columbia
Country
Egypt
South Africa
Morocco
Tunisia
Latitude
30° N
34° S
34° N
37° N
Windhoek
Namibia
23° S
AUSTRALIA AND OCEANIA
City
Adelaide
Brisbane
Canberra
Alice Springs
Hobart
Perth
Sydney
Melbourne
Auckland
State/Country
South Australia
Queensland
New South Wales
Northern Territory
Tasmania
Western Australia
New South Wales
Victoria
Latitude
35° S
27° S
35° S
24° S
43° S
32° S
34° S
38° S
37° S
Washington
EUROPE
City
Amsterdam
Athens
Bern
Copenhagen
Dublin
Frankfurt
Glasgow
Helsinki
Lisbon
London
Madrid
Oslo
Paris
Rome
Country
Netherlands
Greece
Switzerland
Denmark
Ireland
Germany
Scotland
Finland
Portugal
England
Spain
Norway
France
Italy
Sweden
Austria
Poland
Latitude
52° N
38° N
47° N
56° N
53° N
50° N
56° N
60° N
39° N
51° N
40° N
60° N
49° N
42° N
59° N
48° N
52° N
New Zealand
Stockholm
Vienna
Warsaw
57
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APPENDIX D: EC HANDBOX
ᕡ
Important Note:
The Electronic
Fast
Controllers available for
Meade's ETX and DS
telescope series are not
compatible and will not
operate with the LXD75
EC series models. Do
not plug in other
telescope series' EC
handboxes into the
LXD75 computer control
panel, nor plug the
LXD75 EC series
ᕧ
Medium
ᕢ
Moderate
ᕦ
Slow
ᕣ
ᕥ
ᕤ
Fig. 49: Electronic Controller. (1) Arrow Keys; (2) Indicator
Lights; (3) SPEED Key; (4) Coil Cord; (5) MODE Key; (6) OUT
Key; (7) IN Key.
handboxes into any other
telescope series
computer control panel.
Some LXD75 models (designated with an “EC,” for example, AR-5EC) come equipped
with an Electronic Controller (EC) handbox, rather than the Autostar Handbox. The
Electronic Controller provides you with the means to control the telescope motors from
a compact handbox. The Electronic Controller (Fig. 49) has soft-touch keys designed
to have a positive feel, even through gloves.
The primary functions of the Electronic Controller are to move (slew) the telescope to
an object, to set operation for the Northern or Southern Hemispheres, and to indicate
the slew speed.
Users of the EC models should follow the procedures described in GETTING STARTED,
BALANCING THE TELESCOPE, ALIGNING THE VIEWFINDER, CHOOSING AN EYEPIECE,
and OBSERVING BY MOVING THE TELESCOPE MANUALLY, pages 11 - 16. Other sec-
tions relevant to EC users include: OBSERVE THE MOON and SETTING POLAR HOME
POSITION, page 17, and PHOTOGRAPHY, OPTIONAL ACCESSORIES, GENERAL
MAINTENANCE, SPECIFICATIONS, and CELESTIAL COORDINATES, pages 36 - 39 and
46 - 51. LATITUDE CHARTS, page 57, and BASIC ASTRONOMY, pages 63 - 64, may
also be useful. Note that SLEW SPEEDS, page 16, refers to Autostar functions only.
Slew speed functions of the Electronic Controller are covered in this appendix.
The following numbers refer to Fig. 49 above.
ᕡ
Arrow Keys: Press one of the four Arrow keys to slew the telescope (i.e., up,
down, left, and right) at any one of four slew speeds (see SPEED KEY below).
Light No.
Light Status
Light 1
Important Note: If you reverse directions while using the Arrow keys to
slew to objects, there may be a slight pause as the telescope motors com-
pensate for the reversal of the internal gears.
On
Light 2
Light 3
Light 4
Blinking
Off
ᕢ
ᕣ
Indicator Lights: The four red LED (Light Emitting Diode) lights indicate the cur-
rent slew speed of the telescope.
Note: For purposes of this manual, the lights are identified as 1 through 4, with
1 being the top light and 4 being the bottom light.
Fig 50: Indicator Light Key.
The procedures in this manu-
al identify the status of the
four indicator lights as depict-
ed above: on, blinking, or off.
SPEED Key: Press SPEED to change the speed at which the telescope slews to
an object. Each press of the SPEED key changes the slew speed to the next
slower setting. If the controller is already on the slowest slew speed (light 4),
pressing SPEED cycles back to the highest speed (light 1). Slew speeds are sig-
nified by the indicator lights (2, Fig. 49).
ᕤ
Coil Cord: Plug into the HBX connector of the Computer Control Panel.
58
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ᕥ
MODE Key: Press and hold MODE to place the Electronic Controller into the
Mode function, i.e., to select operation for the Northern or Southern Hemisphere.
See TRACKING RATES, page 60.
ᕦ
ᕧ
OUT Key: Use this key to decrease the tracking rate. See TRACKING RATES,
page 60.
IN Key: Use this key to increase the tracking rate. See TRACKING RATES, page
60.
Modes of Operation
• When both the A and B screws are in place, the Northern hemisphere polar mode
is selected when power is applied (i.e., the motor drive is activated for operation in
the Earth’s Northern Hemisphere). This is the factory default mode.
• Remove mode screw B (2, Fig. 51) to make the Southern Hemisphere polar mode
the automatic default of the Electronic Controller when power is applied (i.e., the
motor drive is activated for operation in the Earth’s Southern Hemisphere ).
• Remove mode screw A to disable the tracking function. Select either the Northern
hemisphere polar mode or the Southern Hemisphere polar mode, as described
above, to make the tracking function available. See CHANGING THE POLAR MODE,
page 61, for more information.
Meade Instruments Corporation
35-4702-00
Tested to comply
CC
C
FC
with FCC Standards
FOR HOME OR OFFICE USE
A
B
B
C
Note: Removing either A or B screw affects only the telescope’s default
mode; you may still make mode changes when desired using the MODE key.
Fig. 51: Mode screws on rear of
Electronic Controller. (1) Mode Screw
A; (2) Mode Screw B.
Slew Speeds
The Electronic Controller has four slew speeds that are directly proportional to the
sidereal rate. Press SPEED to change the slew speed (use the Arrow keys to slew
the telescope in the desired direction). Note each slew speed corresponds to one of
the four LED's of the Electronic Controller.
Definition: Sidereal.
As the Earth rotates
beneath the night sky,
the stars appear to move
from East to West. The
speed at which the stars
move is called the side-
real rate. You can setup
your telescope to move
at the sidereal rate so
that it automatically
Light 1 (top LED): The fastest speed. Use to move the telescope quickly from one
point in the sky to another.
Light 2: Best for centering an object in the viewfinder.
Light 3: Best for centering an object in the field of a low-to-moderate power eyepiece,
such as the standard SP 26mm.
Light 4: The slowest speed. Use to center an object in the field of view of high-power
eyepieces, such as the optional 6.7mm or 12.4mm.
The four available speeds are:
tracks the stars and
Light 1 =1200 x sidereal (300 arc-min/sec or 5°/sec)
Light 2 = 32 x sidereal (8 arc-min/sec)
other objects in the night
sky. The tracking function
automatically keeps an
object more or less cen-
tered in the telescope’s
eyepiece.
Light 3 =
Light 4 =
8 x sidereal (2 arc-min/sec)
2 x sidereal (0.5 arc-min/sec )
The two slowest speeds (2x and 8x sidereal) can be used for manual tracking of
astronomical objects while observing through the eyepiece.
See pages 17 and 18 for
more information.
To move the telescope using the Electronic Controller:
1. Insert a low-power eyepiece (e.g., SP 26mm) into the eyepiece holder (2, Fig. 1)
and tighten the eyepiece thumbscrew (1, Fig. 1).
2. Tighten the R.A. and Dec. locks (17 and 33, Fig. 1), if necessary.
3. Verify that the On/Off switch (24D, Fig. 1) on the telescope’s Computer Control
panel is off.
4. Plug in the Electronic Controller coil cord (4, Fig. 49) to the HBX port (24A, Fig.
1) on the Computer Control panel.
5. Flip the power switch to ON. The LED (24C, Fig. 1) on the Computer Control
panel lights.. The Speed indicators lights will cycle off and on in sequence.
6. Press any key on the Electronic Controller and the telescope slews momentarily
in the vertical and horizontal directions to test the motors.
59
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7. When the test is complete, light 1 remains on; lights 2, 3, and 4 turn off.
8. Use the four Arrow keys (1, Fig. 49) to slew the telescope to the desired object.
To change the slew speed, press SPEED.
9. Fine-adjust the position of the object with the Electronic Controller Arrow keys so
that it is centered in the viewfinder. The object is now ready to be viewed through
the telescope’s eyepiece.
Tracking Rates
In polar mode the Electronic Controller normally tracks objects at the sidereal rate (see
TRACKING OBJECTS, page 17). For most observing sessions (once the telescope has
been polar aligned and the tracking motor activated), there is little need to change this
speed.
For objects, like the Moon or a comet, that move at slightly different rates, the Electronic
Controller Arrow keys (1, Fig. 49) are sufficient to move the telescope slightly as the object
very slowly moves off-center through the eyepiece field.
To change the tracking rate, for extended observations of an object not moving at the
sidereal rate, follow the procedure for the appropriate hemisphere:
Use the following procedure to change tracking rates when using the Northern
Hemisphere polar mode. Refer to Fig. 52a.
1. Press and hold MODE (5, Fig. 49) until the Mode function is active (i.e., lights 1
and 2 are on steady; lights 3 and 4 signify whatever tracking mode was last cho-
sen).
2. Press SPEED (3, Fig. 49) until lights 1, 2, and 3 are on steady with light 4 blink-
ing. The telescope is now in the Northern Hemisphere polar mode.
3. Press IN (7, Fig. 49) and light 4 comes on steady. The tracking rate is now 0.5%
faster than sidereal. If the object you're tracking is moving faster than the sidere-
al rate, look through the eyepiece and press IN. Each time you press IN, the track-
ing rate increases by 0.5%. Note that when the Mode function is active, the
tracking motor stops. To restart the tracking motor, press MODE again.
Experiment with this function to get the right speed: Press IN to set the tracking
rate. Then press MODE and look through the eyepiece. Continue pressing IN and
MODE until the object remains centered with little or no drifting in the eyepiece.
Step 2.
Step 3.
Note: The tracking rate can be increased by up to 65%.
Step 4.
Step 5.
4. To use a rate slower than sidereal, press OUT (6, Fig. 49) until light 4 blinks again
(sidereal rate). Press OUT again and light 4 goes out, signifying a tracking rate
0.5% slower than sidereal. Note that when the Mode function is active, the
tracking motor stops. To restart the tracking motor, press MODE again.
Experiment with this function to get the right speed: Press OUT to set the track-
ing rate. Then press MODE and look through the eyepiece. Continue pressing
OUT and MODE until the object remains centered with little or no drifting in the
eyepiece.
Fig. 52a: Indicator Light Key
for changing tracking rates in
the Northern Hemisphere
Polar mode.
Note: The tracking rate can be decreased by up to 65%.
5. Press and hold MODE until only a single light is on. This exits the Mode function.
If Northern or Southern Hemisphere polar mode was chosen, the motor drive
starts operating at the sidereal rate.
6. Use the four Arrow keys (1, Fig. 49) to slew the telescope to the desired object.
To change the slew speed, press SPEED.
Step 2.
Step 3.
Use the following procedure to change tracking rates when using the Southern
Hemisphere polar mode. Refer to Fig. 52b.
1. Press and hold MODE (5, Fig. 49) until the Mode function is active (i.e., lights 1
and 2 are on steady; lights 3 and 4 signify the tracking mode last chosen).
2. Press SPEED (3, Fig. 49) until lights 1 and 2 are on steady, light 3 is off, and Light
4 is blinking.
Step 5.
Step 4.
3. Press IN (7, Fig. 49) and light 4 comes on steady. The tracking rate is now 0.5%
faster than sidereal. Note that when the Mode function is active, the tracking
motor stops. To restart the tracking motor, press MODE again. Experiment
with this function to get the right speed: Press IN to set the tracking rate. Then
press MODE and look through the eyepiece. Continue pressing IN and MODE
until the object remains centered with little or no drifting in the eyepiece.
Fig. 52b: Indicator Light Key
for changing tracking rates in
the Southern Hemisphere
Polar mode.
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Note: The tracking rate can be increased by up to 65%.
4. To use a rate slower than sidereal, press OUT (6, Fig. 49) until light 4 blinks again
(sidereal rate). Press OUT key and light 4 goes out, signifying a tracking rate
0.5% slower than sidereal. Note that when the Mode function is active, the
tracking motor stops. To restart the tracking motor, press MODE again.
Experiment with this function to get the right speed: Press OUT to set the track-
ing rate. Then press MODE and look through the eyepiece. Continue pressing
OUT and MODE until the object remains centered with little or no drifting in the
eyepiece.
Note: The tracking rate can be decreased by up to 65%.
5. Press and hold MODE until only a single light is on. This exits the Mode function.
If Northern or Southern Hemisphere polar mode was chosen, the motor drive
starts operating at the sidereal rate.
6. Use the four Arrow keys (1, Fig. 49) to slew the telescope to the desired object.
To change the slew speed, press SPEED.
Changing the Polar Mode
To use the Electronic Controller to change to Northern or Southern Hemisphere polar
mode, use the following procedure. This procedure also allows you to select a
"Tracking Disabled" setting. Refer to Fig. 53.
Step 4.
Step 3.
1. Complete the SETTING THE POLAR HOME POSITION procedure, described on
page 17.
2. Complete steps 2 through 8 as described in TO MOVETHETELESCOPE USINGTHE
ELECTRONIC CONTROLLER, page 59, to initialize the Electronic Controller.
3. Press and hold MODE until lights 1 and 2 are on steady Ignore lights 3 and 4;
they may or may nor appear as depicted in the figures to the left (how these lights
appear depend upon what has previously has been set).
4. Press SPEED once. This changes the system to polar mode for the Earth’s
Southern Hemisphere, with the motor drive set to operate at the sidereal rate.
5. Press SPEED a second time. This changes the system to polar mode for the
Earth’s Northern hemisphere, with the motor drive set to operate at the sidereal
rate.
Step 5.
Step 6.
Step 8.
Fig. 53: Indicator Light Key for
Changing the Polar Mode.
6. Press SPEED a third time to disable tracking.
7. Use the SPEED key as described in the above steps to cycle among these three
modes (Southern Hemisphere polar, Northern Hemisphere-polar, or Tracking
Disabled) until the desired mode is shown by the appropriate light configuration.
8. Press and hold MODE until just one light is on. This exits the Mode function. If
you choose Northern or Southern Hemisphere polar mode, the motor drive starts
operating at the sidereal rate.
9. Use the four Arrow keys to slew the telescope to the desired object. To change
the slew speed, press SPEED.
™
Optional Autostar Computer Controller for LXD75 EC Users
One of the most important advances in telescope control in the past 25 years, the
Meade Autostar Computer Controller turns your LXD75 EC model into an automatic
celestial object locating system. Just plug Autostar into the telescope’s HBX port in
place of the standard-equipment Electronic Controller, do a quick telescope align-
ment, and you are ready to observe any object in the Autostar’s 30,000-object data-
base.
Best of all, the Meade Autostar is easy to use. Even the most novice observer will
locate dozens of fascinating celestial objects the very first night out. Study Saturn and
its ring system; the primary cloud belts of Jupiter as well as its four major satellites;
the moon-like phases of Mercury and Venus; prominent features on Mars. The Moon
stands out in stark, almost three-dimensional detail—craters, mountain ranges, and
fault lines. In our galaxy, the telescope displays hundreds of nebulae, star clusters,
double and multiple stars, and variable stars—plus dozens of external galaxies in all
their variation of form and structure.
Any of Autostar’s database objects can be called up and entered on the hand con-
troller display in seconds. The observer then simply presses the GO TO pushbutton
and watches as the telescope automatically slews to the object and places it in the
field of view. Autostar moves the telescope to automatically track (follow) the object
across the sky. Autostar brings into easy access objects that were previously unreach-
able for all but the most dedicated of amateur astronomers.
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APPENDIX E: MOUNTING
THE MODEL SC-8 SCHMIDT-
CASSEGRAIN OPTICAL
TUBE
Screws at the
back-end of
the bracket
Slot
How to Attach the Optical Tube to the Mount
The LXD75 model SC-8 Schmidt-Cassegrain assembles and operates identically to
all the other LXD75 models equipped with an Autostar handbox, with one exception:
the optical tube is attached to the mount with a mounting bracket rather than the cra-
dle ring assembly. The optical tube is shipped with the mounting bracket already
attached. To attach the mounting bracket /optical tube assembly to the mount, perform
the following steps.
Groove
Locking Knobs
1. Perform steps 1 through 6 as described in HOWTO ASSEMBLEYOURTELESCOPE,
pages 11 and 12.
Fig. 54 Mounting the SC bracket and
optical tube to the mount.
2. Slide the mounting bracket into the cradle assembly mounting slot. For most
applications, set the groove in the bracket next to the cradle locking knob, so that
the bolt of the cradle locking knob will enter the groove when the knob is tight-
ened. Tighten both the cradle locking knob and the secondary locking knob to a
firm feel. See Fig. 54.
If you are using heavy accessories (such as a camera, microfocuser, etc.) on the
back end of the tube, you may need to balance the tube differently to keep the
tube from drifting downward: Slide the mounting bracket and tube forward, until
the screws at the back end of the tray touch the mount. See Figs. 54 and 55.
Then tighten the cradle locking knob and the secondary locking knob to a firm
feel.
Screws at the
back-end of
the bracket
3. Continue the assembly with step 9 as described in HOWTO ASSEMBLEYOURTEL-
ESCOPE, page12, and complete all the subsequent steps. All other procedures
are identical as described earlier in this manual.
Fig. 55: Adjusting the balance of the
optical tube when using heavy acces-
sories.
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APPENDIX F:
BASIC ASTRONOMY
In the early 17th century Italian Scientist Galileo, using a telescope smaller than your
LXD75, turned it skyward instead of looking at the distant trees and mountains. What
he saw, and what he realized about what he saw, has forever changed the way
mankind thinks about the universe. Imagine what it must have been like being the first
human to see moons revolve around the planet Jupiter or to see the changing phas-
es of Venus! Because of his observations, Galileo correctly realized Earth's move-
ment and position around the Sun, and in doing so, gave birth to modern astronomy.
Yet Galileo's telescope was so crude, he could not clearly make out the rings of
Saturn.
Galileo's discoveries laid the foundation for understanding the motion and nature of
the planets, stars, and galaxies. Building on his foundation, Henrietta Leavitt deter-
mined how to measure the distance to stars, Edwin Hubble gave us a glimpse into the
possible origin of the universe, Albert Einstein unraveled the crucial relationship of
time and light, and 21st-century astronomers are currently discovering planets around
stars outside our solar system. Almost daily, using sophisticated successors to
Galileo's telescope, such as the Hubble Space Telescope and the Chandra X-Ray
Telescope, more and more mysteries of the universe are being probed and under-
stood. We are living in the golden age of astronomy.
Unlike other sciences, astronomy welcomes contributions from amateurs. Much of the
knowledge we have on subjects such as comets, meteor showers, double and vari-
able stars, the Moon, and our solar system comes from observations made by ama-
teur astronomers. So as you look through your Meade LXD75-Series telescope, keep
in mind Galileo. To him, a telescope was not merely a machine made of glass and
metal, but something far more—a window of incredible discovery. Each glimpse offers
a potential secret waiting to be revealed.
Autostar Glossary
Be sure to make use of Autostar’s Glossary feature. The Glossary menu provides an
alphabetical listing of definitions and descriptions of common astronomical terms.
Access directly through the Glossary menu or through hypertext words embedded in
Autostar. See GLOSSARY MENU, page 27, for more information.
Objects in Space
Listed below are some of the many astronomical objects that can be seen with your
LXD75-Series telescope:
The Moon
The Moon is, on average, a distance of 239,000 miles (380,000km) from Earth and is
best observed during its crescent or half phase when Sunlight strikes the Moon’s sur-
face at an angle. It casts shadows and adds a sense of depth to the view (Fig. 56).
No shadows are seen during a full Moon, causing the overly bright Moon to appear
flat and rather uninteresting through the telescope. Be sure to use a neutral Moon fil-
ter when observing the Moon. Not only does it protect your eyes from the bright glare
of the Moon, but it also helps enhance contrast, providing a more dramatic image.
Fig. 56 The Moon. Note
the deep shadows in the
craters.
Using your LXD75-Series telescope, brilliant detail can be observed on the Moon, includ-
ing hundreds of lunar craters and maria, described below.
Craters are round meteor impact sites covering most of the Moon’s surface. With no
atmosphere on the Moon, no weather conditions exist, so the only erosive force is
meteor strikes. Under these conditions, lunar craters can last for millions of years.
Maria (plural for mare) are smooth, dark areas scattered across the lunar surface.
These dark areas are large ancient impact basins that were filled with lava from the
interior of the Moon by the depth and force of a meteor or comet impact.
Twelve Apollo astronauts left their bootprints on the Moon in the late 1960's and early
1970's. However, no telescope on Earth is able to see these footprints or any other
artifacts. In fact, the smallest lunar features that may be seen with the largest tele-
scope on Earth are about one-half mile across.
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Planets
Planets change positions in the sky as they orbit around the Sun. To locate the plan-
ets on a given day or month, consult a monthly astronomy magazine, such as Sky
and Telescope or Astronomy. You can also consult Autostar for information about
planets. Scroll to the "Object: Solar System" menu and scroll through the lists of plan-
ets. When a planet you are interested in displays, press ENTER. Use the Scroll keys
to display information about the planet, such as the planet's coordinates, and the rise
and set times (Tip: enter a date in the Date menu and you can determine if a plan-
et(s) will be visible during the night of the entered date by checking its rise and set
times). Listed below are the best planets for viewing through the LXD75-Series.
Venus is about nine-tenths the diameter of Earth. As Venus orbits the Sun, observers
can see it go through phases (crescent, half, and full) much like those of the Moon.
The disk of Venus appears white as Sunlight is reflected off the thick cloud cover that
completely obscures any surface detail.
Fig. 57: The giant planet,
Jupiter. The four largest
moons can be observed
in a different position
every night.
Mars is about half the diameter of Earth, and appears through the telescope as a tiny
reddish-orange disk. It may be possible to see a hint of white at one of the planet’s
Polar ice caps. Approximately every two years, when Mars is closest to Earth in its
orbit, additional detail and coloring on the planet's surface may be visible.
Jupiter is the largest planet in our solar system and is eleven times the diameter of
Earth. The planet appears as a disk with dark lines stretching across the surface (Fig.
57). These lines are cloud bands in the atmosphere. Four of Jupiter’s moons (Io,
Europa, Ganymede, and Callisto) can be seen as “star-like” points of light when using
even the lowest magnification. These moons orbit Jupiter so that the number of
moons visible on any given night changes as they circle around the giant planet.
Saturn is nine times the diameter of Earth and appears as a small, round disk with
rings extending out from either side (Fig. 58). In 1610, Galileo, the first person to
observe Saturn through a telescope, did not understand that what he was seeing
were rings. Instead, he believed that Saturn had “ears.” Saturn’s rings are composed
of billions of ice particles ranging in size from a speck of dust to the size of a house.
The major division in Saturn's rings, called the Cassini Division, is occasionally visi-
ble through the LXD75-Series. Titan, the largest of Saturn’s moons can also be seen
as a bright, star-like object near the planet.
Fig. 58: Saturn has the
most extensive ring struc-
ture in our Solar System.
Deep-Sky Objects
Star charts can be used to locate constellations, individual stars and deep-sky
objects. Examples of various deep-sky objects are given below:
Stars are large gaseous objects that are self-illuminated by nuclear fusion in their
core. Because of their vast distances from our solar system, all stars appear as pin-
points of light, irrespective of the size of the telescope used.
Nebulae are vast interstellar clouds of gas and dust where stars are formed. Most
impressive of these is the Great Nebula in Orion (M42), a diffuse nebula that appears
as a faint wispy gray cloud. M42 is 1600 light years from Earth.
Fig. 59: The Pleiades is
one of the most beautiful
open clusters.
Open Clusters are loose groupings of young stars, all recently formed from the same
diffuse nebula. The Pleiades is an open cluster 410 light years away (Fig. 59).
Through the LXD75-Series, numerous stars are visible.
Constellations are large, imaginary patterns of stars believed by ancient civilizations
to be the celestial equivalent of objects, animals, people, or gods. These patterns are
too large to be seen through a telescope. To learn the constellations, start with an
easy grouping of stars, such as the Big Dipper in Ursa Major. Then, use a star chart
to explore across the sky.
Galaxies are large assemblies of stars, nebulae, and star clusters that are bound by
gravity. The most common shape is spiral (such as our own Milky Way), but galaxies
can also be elliptical, or even irregular blobs. The Andromeda Galaxy (M31) is the
closest spiral-type galaxy to our own. This galaxy appears fuzzy and cigar-shaped. It
is 2.2 million light years away in the constellation Andromeda, located between the
large “W” of Cassiopeia and the great square of Pegasus.
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LXD75 TIPS
Further Study....
This manual gives only the briefest introduction to astronomy. If you are interested
in pursuing further studies in astronomy, a few topics are suggested below that are
worth reading up on. Try looking up some of these in the optional Autostar glossary.
Also included below is a small sampling of books, magazines, and organizations
that you might find helpful.
Topics
1. How is a star born? How does a solar system form?
2. How is the distance to a star measured? What is a light year? What is red shift
and blue shift?
3. How are the craters on our Moon formed? Is there water under the surface of
the Moon?
4. What is a black hole? A neutron star? A gamma burster? An Einstein lens?
5. What are stars made of? Why are stars different colors? How is the elemental
composition of a star determined? What is an Lyman Alpha forest?
6. What is the difference between a Type 1 and a Type II supernova?
7. What is the importance of studying the composition of comets? Where do
comets come from?
8. How old is our Sun? Will our Sun evolve into a planetary nebula or go super-
nova?
9. What is the Inflationary Big Bang? What is dark matter? What are MACHO's?
10. How are extrasolar planets discovered? What is an accretion (or protoplane-
tary) disk?
11. What are the differences between elliptical, spiral, and irregular galaxies? Can
globular clusters be older than the universe itself?
Books
1. The Guide to Amateur Astronomy by Jack Newton and Philip Teece
2. The Sky: A User’s Guide by David Levy
3. Turn Left at Orion by Guy Consolmagno & Dan Davis
4. Astrophotography for the Amateur by Michael Covington
5. Observing for the Fun of It by Melanie Melton
6. Will Black Holes Devour the Universe? and 100 Other Questions about
Astronomy by Melanie Melton
Magazines
1. Sky & Telescope
Box 9111, Belmont, MA 02178
2. Astronomy
Box 1612, Waukesha, WI 53187
Organizations:
1. Astronomical League
Executive Secretary
5675 Real del Norte, Las Cruces, NM 88012
2. The Astronomical Society of the Pacific
390 Ashton Ave., San Francisco, CA 94112
3. The Planetary Society
65 North Catalina Ave., Pasadena, CA 91106
And watch Jack Horkheimer, Star Gazer, on your local PBS station.
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MEADE LIMITED WARRANTY
Every Meade telescope, spotting scope, and telescope accessory is warranted by Meade Instruments Corporation (“Meade”)
to be free of defects in materials and workmanship for a period of ONE YEAR from the date of original purchase in the U.S.A.
and Canada. Meade will repair or replace a product, or part thereof, found by Meade to be defective, provided the defective
part is returned to Meade, freight-prepaid, with proof of purchase. This warranty applies to the original purchaser only and is
non-transferable. Meade products purchased outside North America are not included in this warranty, but are covered under
separate warranties issued by Meade international distributors.
RGA Number Required: Prior to the return of any product or part, a Return Goods Authorization (RGA) number must be
obtained from Meade by writing, or calling (949) 451-1450. Each returned part or product must include a written statement
detailing the nature of the claimed defect, as well as the owner’s name, address, and phone number.
This warranty is not valid in cases where the product has been abused or mishandled, where unauthorized repairs have been
attempted or performed, or where depreciation of the product is due to normal wear-and-tear. Meade specifically disclaims
special, indirect, or consequential damages or lost profit which may result from a breach of this warranty. Any implied warranties
which cannot be disclaimed are hereby limited to a term of one year from the date of original retail purchase.
This warranty gives you specific rights. You may have other rights which vary from state to state.
Meade reserves the right to change product specifications or to discontinue products without notice.
14-7500-01 9/04B
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