Astronomy Technologies ASTRO-TECH AT60ED Manual

astro-tech AT60ED
Thank you for choosing this Astro-Tech AT60ED high-
quality compact ED doublet refractor.
The images from its f/6 ED (FPL-53 Extra-low Dispersion)
air-spaced doublet optics are virtually color-free. We believe
you'll find the optical performance of your AT60ED to be
exceptional, particularly in view of its very reasonable price.
PARTS OF THE AT60ED
Lock screw for
focuser drawtube
Coarse
Fine
focus
knob
Dust cover
Aperture .................................................. 60mm (2.36")
Focal Length ....................................................360mm
Focal Ratio ...............................................................f/6
Objective Type .............................. air-spaced doublet,
with one element of FPL-53 ED glass
Optical Coatings ................................fully multicoated
Resolving Power
(Dawes' Limit)
Visual Limiting Magnitude .................. 11.4 maximum
Light Grasp
(versus the eye)
Lowest Usable Power ..........9x (with 40mm eyepiece)
Highest Terrestrial Power ...60x (with 6mm eyepiece)
Highest Practical Power ......90x (with 4mm eyepiece)
Theoretical Maximum .......120x (with 3mm eyepiece)
Your Astro-Tech AT60ED refractor is usable for day and
night viewing, simply by adding an appropriate star diagonal
or image erector and an eyepiece. You can use any 1.25" or
2" eyepiece, from a 40mm focal length for the lowest practical
magnification, to a 3mm for high power use.
The AT60ED has a dual speed 2" rack-and-pinion focuser, a
non-marring 2" compression ring accessory holder for use with
2" star diagonals, 2" eyepieces, or 2" photo accessories. Also
supplied is a 1.25" compression ring accessory adapter for use
Drag adjuster for
Retractable dew shield
focuser drawtube
Clamshell ring lock knob
Vixen-style dovetail and photo
tripod mounting foot on
hinged clamshell ring
focus
knob
Astro-Tech AT60ED Apochromatic Refractor Specifications
......... 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 optional
finder (2 of 4)
Focusing
scale on
focuser
drawtube
Left coarse
focus knob
2" accessory
holder
2" accessory
lock knob
(1 of 3)
1.25" accessory
lock knob
Field Stops .... 2 glare-reducing baffles in optical tube,
plus 15 micro-baffles in the focuser drawtube
Focuser ........................dual-speed 2" rack-and-pinion,
1.25" and 2" compression ring accessory holders
Focuser Travel ....................................... 2.95" (75mm)
Lens Shade ...........................retractable, 80.4mm o.d.
Objective Lens Cover ............................. slip-on metal
Tripod Mount ...... Vixen-style foot on hinged clamshell
Tube Diameter ............................................76mm o. d.
Tube Length
Tube Length
Weight
(with1.25" adapter)
with 1.25" star diagonals, terrestrial image erectors, and 1.25"
eyepieces and photo accessories.
The 360mm focal length of your AT60ED is ideal for low
to medium power wide-angle views of nebulas, open star
clusters, large galaxies, and comets. Crisp views of the Moon,
planets, binary stars, and globular clusters are also routine at
magnifications up to 120x when seeing conditions permit.
To calculate the magnification of your telescope and eyepiece
combination, divide the telescope focal length in mm by the
with 10:1 reduction ratio fine focus, and
................. 9" (229mm)
(lens shade retracted)
.......... 10.87" (276mm)
(lens shade extended)
....................3.25 lbs. (1.48 kg)
Lock knob
for focuser
drawtube
Right
coarse
focus
knob
Fine
focus
knob
Brass
compression
rings
1.25"
accessory
adapter