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