Meade Telescope AT80EDT User Manual

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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