astro-tech AT80 EDT
from Astronomy Technologies
Thank you for choosing our Astro-Tech AT80EDT high- magnifications. At its low price, we believe you will find
performance apochromatic triplet ED refractor.
that the visual and photographic performance of your
While some observers might doubt that you can get AT80EDT triplet is little short of remarkable.
apochromatic performance from an 80mm scope that is This instruction sheet will provide you with information
as inexpensive as the Astro-Tech AT80EDT, we can say on how to get the most out of your new refractor, and
only that seeing is believing. how to properly maintain your scope so it can give you a
The images from its fully-multicoated 560mm f/7 ED lifetime of observing enjoyment.
(Extra-low Dispersion element) premium Ohara glass
Please familiarize yourself with your telescope’s parts
triplet optics are virtually color-free, even at high and functions before operating it for the first time.
PARTS OF THE AT80EDT
1.25” eyepiece
lock knob
Locking collar for 360°
rotatable focuser
Retractable
dew shield
Mounting point for
optional finder
Focusing
scale on
focuser
drawtube
Combined equatorial mount
dovetail and L-bracket
tripod mounting shoe
Left coarse
focus knob
Fine
focus
knob
Fine
focus
knob
Lock knob for
focuser drawtube
Right
coarse
focus
knob
1/4”-20 thread
2”
tripod mounting holes
in base of reversible
bracket
eyepiece
holder
Right
coarse
focus
knob
1.25”
eyepiece
adapter
Dust cover
1.25”
eyepiece
lock knob
Brass compression ring
1.25”
eyepiece
adapter
2” eyepiece
lock knob
1.25” eyepiece
lock knob
Astro-Tech AT80EDT Apochromatic Triplet Refractor Specifications
Aperture.............................................. 80mm (3.1”) Objective Lens Cover .........................slip-on metal
Focal Length ...............................................560mm Tripod Mount .. removable combination L-bracket and
Focal Ratio ........................................................ f/7
Objective Type.............. triplet using Ohara ED glass
Optical Coatings ........................... fully multicoated
dovetail for direct mounting on Celestron, Meade,
and Vixen equatorial mounts; two 1/4”-20 thread
mounting holes for photo tripod use
Resolving Power (Dawes’ Limit)....... 1.45 arc seconds Tube Diameter ......................................90mm o. d.
Visual Limiting Magnitude ..............12.0 maximum Tube Length (lens shade retracted)..... 17.75” (451mm)
Light Grasp (versus the eye).............................. 131x Tube Length (lens shade extended) ... 20.25” (514mm)
Field Stops .........glare-reducing baffle in optical tube Optical Tube Weight...................6.75 lbs. (3.07 kg)
Focuser .............................dual-speed Crayford-type Case ............................. aluminum-frame foam-fitted
with 11:1 reduction ratio fine focus;
lockable hard case, with carrying handle
2” and 1.25” compression ring eyepiece holders; Case Dimensions .................22.25” x 12.75” x 8.25”
360° rotating camera angle/observing angle adjuster Lowest Usable Power............ 14x (40mm eyepiece)
Focuser Travel ................................... 3.1” (80mm), Highest Terrestrial Power .......80x (7mm eyepiece)
millimeter scale on drawtube for repeatable focus Highest Practical Power........ 140x (4mm eyepiece)
Lens Shade ............................................ retractable Theoretical Maximum ........... 187x (3mm eyepiece)
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