Meade Astro-Tech AT 127EDT User Manual

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astro-tech

AT127EDTfrom 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”)

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

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

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