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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