Meade Telescope AT66ED User Manual

astro-tech AT66ED  
from Astronomy Technologies  
Thank you for choosing this Astro-Tech AT66ED high-  
quality compact apochromatic refractor.  
you’ll find that the optical performance of your AT66ED is  
little short of astonishing.  
While some observers might doubt that apochromatic  
performance can be had in a 66mm scope that costs as little  
as the AT66ED, we can say only that seeing is believing.  
The images from its 400mm f/6 ED (Extra-low Dispersion  
glass element) air-spaced doublet optics are virtually color-  
free, even at high magnifications. At its low price, we believe  
This instruction manual will provide you with information  
on how to get the most out of your new telescope, and how  
to properly maintain your telescope so it can give you a  
lifetime of observing enjoyment.  
Please familiarize yourself with your telescope’s parts and  
functions before operating it for the first time.  
Locking collar for 360°  
Mounting point for  
optional finder  
PARTS OF THE AT66ED  
rotatable focuser  
Retractable dew shield  
Focusing  
Thread-on  
scale on  
1.25”  
focuser  
eyepiece  
drawtube  
adapter  
Astro -Tech  
1/4”-20 thread  
tripod mounting holes  
in base of bracket  
Lock knob  
for focuser drawtube  
underneath body  
Fine  
focus  
knob  
Left coarse  
focus knob  
Combined equatorial mount  
dovetail and L-bracket  
Right  
Dust cover  
coarse  
focus  
knob  
Dust  
cap  
tripod mounting shoe  
Brass compression ring  
1.25” eyepiece  
lock knob  
1.25” eyepiece  
lock knob  
Thread-on 1.25”  
eyepiece  
adapter  
Astro-Tech AT66ED Apochromatic Refractor Specifications  
Aperture ................................................... 66mm (2.6”) Objective Lens Cover............................. slip-on metal  
Focal Length ....................................................400mm Tripod Mount ... removable combination L-bracket and  
Focal Ratio ...............................................................f/6  
ObjectiveType .... air-spaced doublet with ED element  
Optical Coatings................................ fully multicoated  
dovetail with 1/4”-20 thread mounting holes for photo  
tripod use as well as direct mounting on Celestron,  
Meade, and Vixen German equatorial mounts  
Resolving Power (Dawes’ Limit) ...... 1.75 arc seconds Tube Diameter............................................ 75mm o. d.  
Visual Limiting Magnitude.................. 11.6 maximum Tube Length (lens shade retracted) ..... 11.5” (292mm)  
Light Grasp (versus the eye) ................................. 89x Tube Length (lens shade extended)..... 14.4” (366mm)  
Field Stops .... 10 glare-reducing baffles in optical tube OpticalTube Weight............................ 3.9 lbs. (1.8 kg)  
Focuser ............................... dual-speed Crayford-type Case.................................. aluminum-frame foam-fitted  
with 11:1 reduction ratio fine focus;  
lockable hard case, with carrying handle  
360° rotating camera angle/observing angle adjuster; Case Dimensions .............................15” x 9.5” x 6.25”  
and thread-on 1.25” compression ring eyepiece holder Lowest Usable Power........ 10x (with 40mm eyepiece)  
FocuserTravel ......................................... 2.4” (60mm) HighestTerrestrial Power ... 67x (with 6mm eyepiece)  
with millimeter scale on drawtube for repeatable focus Highest Practical Power.... 100x (with 4mm eyepiece)  
Lens Shade .................................................retractable Theoretical Maximum........ 133x (with 3mm eyepiece)  
 

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