Meade Telescope AT90EDT User Manual

astro-tech  
AT 9 0 E D T from Astronomy Technologies  
Thank you for choosing this Astro-Tech AT90EDT of your AT90EDT is little short of astonishing.  
high-performance apochromatic ED triplet refractor.  
This instruction sheet will provide you with information  
The images from its fully-collimatable 600mm f/6.7 on how to get the most out of your new refractor, and  
ED (Extra-low Dispersion) air-spaced triplet optics are how to properly maintain your telescope so it can give  
virtually color-free, even at high magnifications, thanks you a lifetime of observing enjoyment.  
to its use of advanced Ohara FPL-53 ED glass. At its  
Please familiarize yourself with your telescope’s parts  
price, we believe you’ll find that the optical performance and functions before operating it for the first time.  
PARTS OF THE AT90EDT  
Mounting shoe for  
optional finder  
Lock knob for 360°  
rotatable focuser  
Focusing  
scale on  
focuser  
2”  
drawtube  
Lock knob for  
focuser drawtube  
eyepiece  
1.25”  
holder  
eyepiece  
Retractable dew shield  
holder  
Fine  
focus  
knob  
Mounting shoe for  
optional finder  
Left coarse  
focus knob  
Brass compression ring  
Dust cover  
2”  
Right  
coarse  
focus  
knob  
eyepiece  
holder  
1.25”  
eyepiece  
holder  
2” eyepiece  
lock knob  
1.25” eyepiece  
lock knob  
1.25”  
eyepiece  
holder  
1.25” eyepiece  
lock knob  
Astro-Tech AT90EDT Apochromatic ED Triplet Refractor Specifications  
Aperture............................................ 90mm (3.54”) Finder ................mounting shoe provided for optional  
Focal Length ...............................................600mm Astro-Tech multiple reticle finder or similar finder  
Focal Ratio ......................................................f/6.7 Lens Shade ............................................ retractable  
Objective Type........... collimatable air-spaced triplet Lens Shade Outer Diameter .......................130mm  
using Ohara FPL-53 ED glass Objective Lens Cover .........................slip-on metal  
Optical Coatings ........................... fully multicoated Tube Diameter .................................... 114mm o. d.  
Resolving Power (Dawes’ Limit)....... 1.29 arc seconds  
Tube Length (lens shade retracted)...... 18.9” (480mm)  
Visual Limiting Magnitude ..............12.3 maximum Tube Length (lens shade extended) ....21.75” (552mm)  
Light Grasp (versus the eye).............................. 165x Optical Tube Weight...................11.45 lbs. (5.2 kg)  
Field Stops .......................... three knife-edge baffles Case ............................. aluminum-frame foam-fitted  
Focuser .......................... dual-speed rack and pinion  
lockable hard case, with carrying handle  
with 11:1 reduction ratio fine focus; Case Dimensions ................................ 28” x 9” x 9”  
2” and 1.25” compression ring eyepiece holders; Lowest Usable Power............ 15x (40mm eyepiece)  
360° rotating camera angle/observing angle adjuster Highest Terrestrial Power .......85x (7mm eyepiece)  
Focuser Travel .................................. 4.7” (120mm) Highest Practical Power........ 150x (4mm eyepiece)  
with millimeter scale on drawtube for repeatable focus Theoretical Maximum ........... 200x (3mm eyepiece)  
 

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