Bushnell Telescope 78 9570 User Manual

570 x 60 Rotary Compact Refractor Telescope  
Model 78-9570  
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HOW TO USE YOUR NEW TELESCOPE  
Astronomical telescopes are designed in such a way that the image you see appears  
UPSIDE DOWN and REVERSED, this is acceptable for viewing celestial bodies.  
Selecting an Eyepiece:  
1. Always begin viewing with the lowest power eyepiece, which in this case is the 20mm lens. Note: the base  
power of each eyepiece is determined by the focal length of the telescope objective lens, which for this model  
is 910 mm. A formula can be used to determine the power of each eyepiece: teles cope OBJ ECTIVE lens  
focal length  
EYEPIECE focal length = MAGNIFICATION (e.g. Using the 20 mm lens, the calculation  
would look like this: 910mm ¸ 20mm = 46x or 46 power.)  
2. To select the 20mm eyepiece, position the Rotary Power Turret® (14) so that the 20mm eyepiece is in line  
with the Ocular Alignment Arrow.  
3. Included in the Acces s ory Turret (15) is a Barlow lens. Barlow lenses are used to double or triple the power  
of your telescope. Using the example above, your 2.5x Barlow lens would give you a total power of 115x or  
115 power. (46 x 2.5 = 115x or 115 power).  
4. The full moon can be so bright that distinct surface details are difficult to view and prolonged viewing is  
uncomfortable. Included in the Acces s ory Turret® (15) is a Moon Filter. Moon Filters are specially tinted  
lenses that reduce the glare of the moon so that enjoyable viewing can take place.  
Focus ing Teles cope:  
1. After selecting the desired eyepiece, aim main telescope tube at a land-based target at least 200 yards away  
(e.g. telephone pole or building). Fully extend focusing tube by turning Rack and Pinion Focus ing  
Mechanis m (12).  
2. While looking through selected eyepiece (in this case the 20 mm), slowly retract focusing tube by turning  
Rack and Pinion Focus ing Mechanis m until object comes into focus.  
Aligning Finders cope:  
Remove plastic insert on bottom side of finderscope to allow battery to make connection with battery contact for  
power. Turn power switch on. See finderscope page.  
Look through main telescope tube at low power and establish a well-defined stationary target. Looking through  
red dot finderscope, alternate tightening each adjustment wheel (at rear and left side of finderscope) until the red  
dot of finderscope is precisely aligned and centered on the same object being viewed in main telescope tube.  
See finderscope page.  
Now, objects located first with the Finders cope (16) will be centered in the main telescope.  
Viewing Land-Bas ed Objects :  
1. The T-18 Erecting Lens will correct the normally upside down and reversed image so that you can easily  
enjoy observing land-based objects through your compact telescope.  
2. Simply insert the T-18 Erecting Lens into the T-18 Erecting Lens Receptor (13).  
3. Repeat focusing directions as described above except that you will be looking through the T-18 Erecting Lens  
instead of the 20mm eyepiece. Note: When the T-18 Erecting Lens is inserted into the T-18 Erecting Lens  
Receptor (13) the Eyepieces contained in the Rotary Power Turret® (14) will be inoperable. Remove the  
T-18 Erecting Lens to regain eyepiece functionality.  
Trans porting and Storing Teles cope:  
1. Loosen tripod-locking screws and collapse each tripod leg section. Collapse Tripod Leg Brace (8) and pull  
all three tripod legs together. Loosen Vertical Adjus tment Lock (4) and tilt objective end of telescope  
toward tripod legs. Slip telescope into carrying case and pull drawstring to close.  
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Please find below an image depicting how to attach the red dot finderscope and an image  
depicting a fully-attached unit.  
How-To-Attach: Place Finderscope Cylindrical Groove over Cylindrical Finderscope Mount  
Post until it clicks into place.  
Plastic Insert  
Adjustment  
Wheels  
Aligning and Using Red Dot Finderscope  
Remove plastic insert on bottom side of finderscope to allow battery to make connection with  
battery contact for power. Turn power switch on.  
Look through main telescope tube at low power and establish a well-defined stationary target.  
Looking through red dot finderscope, alternate tightening each adjustment wheel (at rear and  
left side of finderscope) until the red dot of finderscope is precisely aligned and centered on the  
same object being viewed in main telescope tube.  
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Never Look Directly At The Sun With Your Telescope  
Permanent Damage To Your Eyes May Occur  
Enjoying Your New Teles cope  
1. First determine your targeted object. Any bright object in the night sky is a good starting point. The moon is  
favorite starting points in astronomy is the moon. This is an object sure to please any budding astronomer or  
experienced veteran. When you have developed proficiency at this level, other objects become good targets.  
Saturn, Mars, Jupiter, and Venus are good second steps to take.  
2. The first thing you need to do after assembling the telescope as planned is center the desired object in the  
finderscope's cross hairs. Provided you did a reasonable job aligning the finderscope, a quick look through  
the main telescope tube at low power should reveal the same image. With the lowest power eyepiece (the  
one with the largest number printed on it) you should be able to focus the same image that you saw through  
the finderscope. Avoid the temptation to move directly to the highest power. The low power eyepiece will  
give you a wider field of view, and brighter image--thus making it very easy to find your target object. At this  
point with a focused image in both scopes, you've passed the first obstacle. If you don't see an image after  
attempting to focus it in, you might consider aligning your finderscope again. Once you pass this step, you  
will enjoy the time spent ensuring a good alignment. Every object you center in the finderscope will be easily  
found in the main telescope tube, which is important for continuing your exploration of the night sky.  
3. The low power eyepieces are perfect for viewing the full moon, planets, star clusters, nebulae, and even  
constellations. These should build your foundation. However, for more detail, try bumping up in magnification  
to higher power eyepieces on some of these objects. During calm and crisp nights, the light/dark separation  
line on the moon (called the "Terminator") is marvelous at high power. You can see mountains; ridges and  
craters jump out at you due to the highlights.  
Similarly, you can move up to higher magnifications on the  
planets and nebulae. Star clusters and stars are best viewed through the low power no matter what.  
4. The recurring astronomical theater we call the night sky is an ever-changing billboard. In other words, not the  
same movie plays all the time. Rather, the positions of the stars change not only hourly as they seem to rise  
and set, but also throughout the year. As the earth orbits the sun our perspective on the stars changes on a  
yearly cycle about that orbit. The reason the sky seems to move daily just as the sun and the moon "move"  
across our sky, is that the earth is rotating about its axis. As a result you may notice that after a few minutes  
or a few seconds depending on what power you are viewing at, the objects in your telescope will move. At  
higher magnifications especially, you will notice that the moon or Jupiter will "race" right out of the field of  
view. To compensate, just move the fine adjustment controls on your telescope to "track" it in the necessary  
path.  
Helpful Hints  
1. Your telescope is a very sensitive instrument. For best results and fewer vibrations set your telescope up on  
a level location on the ground rather than your concrete driveway or your wooden deck. This will provide a  
more stable foundation for viewing, especially if you've drawn a crowd with your new telescope.  
2. If possible, view from a location that has relatively few lights. This will allow you to see much fainter objects.  
You'd be surprised how much more you'll see from your local lake or park when compared to a backyard in  
the city.  
3. Using your telescope out a window is NEVER recommended.  
4. View objects that are high in the sky if possible. Waiting until the object rises well above the horizon will  
provide a brighter and crisper image. Objects on the horizon are viewed through several layers of earth's  
atmosphere. Ever wonder why the moon appears orange as it sets on the horizon. It's because you are  
looking through a considerable more amount of atmosphere than you would directly overhead. (Note: If  
objects high in the sky are distorted or wavy, you are probably viewing on a very humid night.) During nights  
of unstable atmosphere, viewing through a telescope can be frustrating if not impossible. Astronomers refer  
to crisp, clear nights as nights of "good seeing."  
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Where do I s tart?  
Your Bushnell telescope can bring the wonders of the universe to your eye. While this manual is intended to  
assist you in the set-up and basic use of this instrument, it does not cover everything you might like to know about  
astronomy. The first thing you need to do is get a very simple star chart and a flashlight with a red bulb or red  
cellophane over the end. For objects other than stars and constellations, a basic guide to astronomy is a must.  
Some recommended sources appear on our website at www.bus hnell.com. Also on our website will be current  
events in the sky for suggested viewing. But, some of the standbys that you can see are:  
The Moon--a wonderful view of our lunar neighbor can be enjoyed with any magnification. Try viewing at different  
phases of the moon. Lunar highlands, lunar Maria (lowlands called "seas" for their dark coloration), craters,  
ridges and mountains will astound you.  
Saturn--even at the lowest power you should be able to see Saturn's rings and moons. This is one of the most  
satisfying objects in the sky to see simply because it looks like it does in pictures. Imagine seeing what you've  
seen in textbooks or NASA images from your backyard!  
Jupiter--the largest planet in our solar system is spectacular. Most noted features are its dark stripes or bands  
both above and below its equator. These are the north and south equatorial belts. Also interesting are Jupiter's  
four major moons. Pay close attention to their positions from night to night. They appear to be lined up on either  
side of Jupiter.  
Mars--The Great Red Planet appears as a reddish-orange disk. Look at different times of the year and try to  
catch a glimpse of the white polar ice caps.  
Venus--just like the moon, Venus changed phases from month to month. Some views of brilliant Venus appear  
as if you were looking at a distant crescent moon.  
Nebulae--The Great Orion Nebula is a very well known night sky object. This and many others are brought to you  
by this telescope.  
Star Clusters--View millions of stars densely packed in a cluster that resembles a ball.  
Galaxies--One of the greatest and most interesting galaxies is our neighbor the Andromeda Galaxy. Enjoy this  
and many others.  
Much, much, more!  
For further questions or additional information please contact:  
Bushnell Sports Optics Worldwide  
9200 Cody  
Overland Park, KS 66214  
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ANSWERS TO COMMONLY ASKED QUESTIONS  
1. The image I see in the telescope is upside down  
·
An upside-down and reversed image is  
a
common characteristic of most astronomical  
telescopes. Since telescopes are used for  
astronomical viewing orientation is not important.  
However, as described above, the T-18 erecting  
lens can be used to provide normal images.  
and reversed from right to left?  
2. How do I determine the power my telescope?  
3. Where do I find the Telescope Focal Length  
·
·
The power of your telescope can be determined  
by dividing the focal length of the objective lens  
by the focal length of the eyepiece. The  
eyepiece focal length is the number printed on  
the eyepiece. (For example: 1000 ¸ 25 = 40X)  
The telescope focal length is the same focal  
length as the objective focal length. For this  
telescope it is 910mm. Telescope focal lengths  
range from 600mm to 910mm on Bushnell  
telescopes.  
4. What can I see with my telescope?  
·
·
Telescopes with power ranging from 25X to 50X  
can be used to view Star Clusters and Nebulae.  
90X to 120X telescopes can view galaxies. Most  
planets can be seen at 150X and higher.  
5. What do the numbers on the eyepiece mean?  
The numbers on the eyepiece represents the  
“focal Length” of the eyepiece.  
TROUBLESHOOTING GUIDE  
If after you have set-up your new telescope you are unable to see any objects, use this Quick  
Reference guide to help you to understand the cause of the problem and quickly determine a remedy  
1. I’ve completed the set-up yet I cannot see anything  
·
·
·
Check to see if objective lens cover has been  
removed.  
Try to view an object that is 200 or more yards  
away.  
If there is more than one eyepiece included with  
the telescope, use the lowest power (highest  
number) eyepiece to begin viewing.  
·
Use the Rack & Pinion Focus ing Mechanis m (3) to  
bring the object you are trying to view into focus  
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