astro-tech
AT 1 2 7 E D T
from Astronomy Technologies
Thank you for choosing this Astro-Tech AT127EDT performance of your AT127EDT is very impressive for its
ED triplet refractor.
The lenses in your scope’s 950mm f/7.5 air-spaced
very reasonable price.
This instruction sheet will provide you with information
triplet optics include an advanced ED (Extra-low on how to get the most out of your new Astro-Tech
Dispersion) glass element to give you images that are refractor, and how to properly maintain it so it can give
virtually color-free, even at very high powers. Thanks to you a lifetime of observing enjoyment.
its computer-optimized optical design, quality ED glass,
Please familiarize yourself with the parts and functions
and high transmission multicoatings, the optical of your AT127EDT before using it for the first time.
PARTS OF THE AT127EDT
Retractable
Carrying handle/accessory mount
dew shield
Tube ring
lock knob
(1 of 2)
2” star
diagonal
Tube
rings
Finderscope focusing ring
Finderscope focus lock ring
Illuminator
on/off/brightness
control
1.25”
eyepiece
holder
Vixen-style
dovetail
Finderscope
collimating
8x50mm
finderscope
screw (1 of 3)
Mounting point
for finder
Carrying handle/accessory mount
Finderscope illuminator
Fine focus
knob
Crosshair focus lock ring
Crosshair focusing ring
Lock knob for
focuser drawtube
Left coarse 2” accessory 2” accessory
focus knob lock knob holder
Right coarse
focus knob
Astro-Tech AT127EDT ED Triplet Refractor Specifications
Aperture............................................... 127mm (5”) Lens Shade Outer Diameter .......................156mm
Focal Length ...............................................950mm Objective Lens Cover ..................... thread-in metal
Focal Ratio ...................................................... f/7.5 Tube Diameter .................................... 130mm o. d.
Objective Type.............................. air-spaced triplet Tube Rings .... dual split hinged rings with Vixen-style
Optical Coatings ........................... fully multicoated
Resolving Power (Dawes’ Limit)........ 0.91 arc seconds
Visual Limiting Magnitude ..............13.0 maximum
dovetail and carrying handle/accessory mount
Tube Length (lens shade retracted) ..... 33.25” (845mm)
Tube Length (lens shade extended)......37.25” (946mm)
Light Grasp (versus the eye) ............................... 329x Optical Tube Weight................. 18.75 lbs. (8.52 kg)
Field Stops ................ two internal knife-edge baffles Case ............................. aluminum-frame foam-fitted
Focuser .......................... dual-speed rack and pinion
lockable hard case, with carrying handle
with 10:1 reduction ratio fine focus Case Dimensions ....................... 36.5” x 14.5” x 10”
and 2” and 1.25” compression ring eyepiece holders Lowest Usable Power............ 19x (50mm eyepiece)
Focuser Travel ................................ 4.25” (108mm) Highest Practical Power........ 238x (4mm eyepiece)
Finder .........8 x 50mm with erect right-reading image Theoretical Maximum ........ 271x (3.5mm eyepiece)
and variable brightness illuminated crosshair reticle Supplied Accessories.......... 10mm and 20mm 1.25”
Lens Shade ............................................ retractable
eyepieces; enhanced 99% reflectivity 2” diagonal
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