astro-tech

AT 127EDTfrom 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

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.

PARTS OF THE AT127EDT

Retractable

dew shield

Carrying handle/accessory mount

 

 

 

 

Tube ring

2” star

 

lock knob

Tube

diagonal

(1 of 2)

rings

 

 

 

 

Finderscope focusing ring

 

Finderscope focus lock ring

 

 

Illuminator

 

 

on/off/brightness

1.25”

 

control

Vixen-style

eyepiece

dovetail

Finderscope

holder

8x50mm

collimating

 

finderscope

screw (1 of 3)

Mounting point

 

 

Carrying handle/accessory mount

for finder

Finderscope illuminator

Fine focus

 

Crosshair focus lock ring

knob

 

Crosshair focusing ring

 

Lock knob for

 

focuser drawtube

 

 

 

 

Left coarse

2” accessory

 

2” accessory Right coarse

 

 

 

focus knob

lock knob

 

holder

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

dovetail and carrying handle/accessory mount

Resolving Power (Dawes’ Limit)

0.91 arc seconds

Tube Length (lens shade retracted)

33.25” (845mm)

Visual Limiting Magnitude

13.0 maximum

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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Meade AT 127EDT instruction sheet Objective Lens Cover, Resolving Power Dawes’ Limit, Visual Limiting Magnitude