Meade AT 127EDT - Manual

astro -tech
AT 127 E DT

f ro m A s t ro n o my Te ch n o l o g i e s

Thank you for choosing this

Astro-Tech AT 127EDT

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 AT 127EDT 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 AT 127EDT 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 AT 127EDT

Left coarse

focus knob

Fine focus

knob

2” accessory

lock knob

Right coarse

focus knob

1.25”

eyepiece

holder

2” star

diagonal

Carr ying 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)

Carr ying 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