Astro-Tech AT60EDT Quick Start Manual

astro-tech A T 60EDT
Thank you for choosing this Astro-Tech AT60EDT high-
quality compact ED triplet apochromatic refractor.
The images from its 420mm f/7 ED (Extra-low Dispersion
glass) air-spaced triplet optics are essentially color-free. We
believe you'll find the optical performance of your AT60EDT
to be exceptional, particularly in view of its reasonable price.
PARTS OF THE AT60EDT
Coarse Lock knob for 360°
focus rotatable focuser
knob
Focuser
rack
Lock knob
Fine
for focuser drawtube
focus
knob
Dust cover
Astro-Tech AT60EDT Apochromatic Refractor Specifications
Aperture ................................................. 60mm (2.36")
Focal Length .................................................... 420mm
Focal Ratio ............................................................... f/7
Objective Type ....... air-spaced triplet with ED element
Optical Coatings ................................ fully multicoated
Resolving Power
(Dawes' Limit)
Visual Limiting Magnitude .................. 11.4 maximum
Light Grasp
(versus the eye)
Baffling ................ anti-reflection threading in drawtube
Focuser ........................ dual-speed 2" rack-and-pinion
with 10:1 reduction ratio fine focus; lock knob;
360° rotating camera angle/observing angle adjuster;
and 1.25" and 2" compression ring accessory holders
Focuser Travel ....................................... 3.75" (95mm)
with millimeter scale on drawtube for repeatable focus
Lens Shade .............................. retractable, 85mm o.d.
Your Astro-Tech AT60EDT refractor is usable for day and night
viewing, simply by adding an appropriate star diagonal and
eyepiece. Any brand of 1.25" or 2" eyepiece can be used, from a
40mm focal length for the lowest possible magnification (10.5x),
to a 3mm (140x) for high power use.
The AT60EDT has a 2" focuser with a non-marring 2" brass
Retractable dew shield
Combined removable
Vixen-style equatorial mount
dovetail and tripod
mounting foot
.......... 1.93 arc seconds
...................................... 73x
from Astronomy Technologies
This instruction manual will provide you with information
on how to get the most out of your new telescope, and how
to properly maintain your telescope so it can give you a
lifetime of observing enjoyment.
Please familiarize yourself with your telescope's parts and
functions before operating it for the first time.
Mounting points for
an optional finder
Left coarse
focus knob
Focusing
scale on
focuser
drawtube
2" accessory
lock knob
Objective Lens Cover ............................. slip-on metal
Tripod Mount ............ removable Vixen-style L-shaped
dovetail for direct mounting on Astro-Tech, Celestron,
Meade, and Vixen mounts; dovetail also has a 1/4"-20
thread mounting hole for use on a photo tripod
Tube Diameter ............................................ 75mm o. d.
Tube Length
(lens shade retracted)
Tube Length
(lens shade extended)
Optical Tube Weight .. 5.3 lbs. (2.41 kg), 10 lbs. w/case
Case .................................. aluminum-frame foam-fitted
lockable hard case, with carrying handle
Case Dimensions ............................. 15.5" x 10" x 7.5"
Lowest Usable Power ..... 10.5x (with 40mm eyepiece)
Highest Terrestrial Power ... 60x (with 7mm eyepiece)
Highest Practical Power .... 105x (with 4mm eyepiece)
Theoretical Maximum ........ 140x (with 3mm eyepiece)
compression ring accessory adapter for use with a 2" star diagonal
and 2" eyepieces or 2" photo accessories. Also supplied is a 1.25"
brass compression ring accessory adapter for use with 1.25" star
diagonals, terrestrial image erectors, and 1.25" photo accessories.
The 420mm focal length of your AT60EDT is ideal for low to
medium power wide-angle views of nebulas, open star clusters,
Lock knob
for 360°
rotatable
focuser
Right
coarse
focus
knob
1.25" accessory
adapter
.............. 11" (279mm)
.............. 14" (355mm)
Fine
focus
knob