Meade Telescope AT80ED User Manual

astro-tech AT80ED  
from Astronomy Technologies  
Thank you for choosing this Astro-Tech AT80ED high- a clear step ahead of competitive scopes.  
performance ED refractor.  
At its exceptionally low price, we believe that you will  
The images from its fully-multicoated ED (Extra-low find that the mechanical and optical performance of your  
Dispersion glass element) air-spaced doublet optics are AT80ED is little short of astonishing.  
virtually free of the annoying violet haloes of chromatic  
This instruction sheet will provide you with information  
aberration (spurious color) that are typically seen around on how to get the most out of your new telescope, and  
the Moon, planets, and bright stars in lesser refractors. how to properly maintain your telescope so it can give  
Precision-made, with many useful mechanical features you a lifetime of observing enjoyment.  
(such as a rotating dual-speed focuser and a very flexible  
Please familiarize yourself with your telescope’s parts  
split ring plus dovetail mounting system), the AT80ED is and functions before operating it for the first time.  
PARTS OF THE AT80ED  
Tube ring  
Retractable dew shield  
Locking collar for 360°  
Right  
coarse  
focus  
knob  
Fine  
focus  
knob  
rotatable focuser  
Hinged split  
tube rings  
Mounting points for  
optional finder  
Focusing  
scale on  
focuser  
drawtube  
2”  
Fine  
focus  
knob  
Lock knob for  
focuser drawtube  
Left coarse  
focus knob  
accessory  
holder  
Removable  
Vixen-style dovetail  
Dust cover  
Right  
coarse  
focus  
knob  
Locking collar for 360°  
rotatable focuser  
1.25” eyepiece  
lock knob  
Dust  
cap  
Brass compression ring  
2” eyepiece  
lock knob  
1.25” eyepiece  
lock knob  
1.25”  
eyepiece  
adapter  
Astro-Tech AT80ED Doublet Refractor Specifications  
Aperture ................................................... 80mm (3.1”) Objective Lens Cover............................. slip-on metal  
Focal Length ....................................................560mm Tripod Mount .............dual split hinged tube rings with  
Focal Ratio ...............................................................f/7  
Vixen-style dovetail for direct mounting on  
ObjectiveType .... air-spaced doublet with ED element  
Astro-Tech, Celestron, Meade, and Vixen mounts  
Optical Coatings................................ fully multicoated Tube Diameter............................................ 90mm o. d.  
Resolving Power (Dawes’ Limit) ...... 1.45 arc seconds Tube Length (lens shade retracted) ........ 18” (457mm)  
Visual Limiting Magnitude.................. 12.0 maximum Tube Length (lens shade extended)... 21.75” (527mm)  
Light Grasp (versus the eye) ............................... 131x OpticalTube Weight.....6.8 lbs (3.09 kg) with standard  
Field Stops ...two glare-reducing baffles in optical tube  
focuser; 6.45 lbs (2.93 kg) with optional Feather Touch  
Focuser ............................... dual-speed Crayford-type  
focuser (both weights include rings and dovetail)  
with 11:1 reduction ratio fine focus Case.................................. aluminum-frame foam-fitted  
(a 10:1 ratio Feather Touch focuser is optional);  
lockable hard case, with carrying handle  
360° rotating camera angle/observing angle adjuster; Case Dimensions .................... 20.75” x 12.75” x 8.75”  
and 2” and 1.25” compression ring eyepiece holders Lowest Usable Power............... 14x (40mm eyepiece)  
FocuserTravel ....................................... 3.35” (85mm) HighestTerrestrial Power .......... 80x (7mm eyepiece)  
with millimeter scale on drawtube for repeatable focus Highest Practical Power........ 160x (3.5mm eyepiece)  
Lens Shade .................................................retractable Theoretical Maximum............... 187x (3mm eyepiece)  
 

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