Astro-Tech AT106LE Manual

astro-tech
A T 106 LE
Thank you for choosing this Astro-Tech AT106LE Limited
Edition high-performance apochromatic ED triplet refractor.
The AT106LE uses the same premium optics as the AT106,
which Sky & Telescope magazine said provided "all the benefits
of a first-class 4-inch apo but without the premium price."
Astro-Tech AT 106 LE Apochromatic ED Triplet Refractor Specifications
Aperture .......................................... 106mm (4.17")
Focal Length ...............................................690mm
Focal Ratio ...................................................... f/6.5
Objective Type ........... collimatable air-spaced triplet
using all Ohara glass, including an FPL-53 ED element
Optical Coatings ........................... fully multicoated
Resolving Power
(Dawes' Limit)
Visual Limiting Magnitude .............. 12.6 maximum
Light Grasp
(versus the eye)
Field Stops .......................... three knife-edge baffles
Focuser ................................ 2" dual-speed Crayford
with 10:1 reduction ratio fine focus;
2" and 1.25" compression ring accessory holders;
360° rotating focuser for camera angle rotation
Focuser Travel ............ 70mm (2.75") with mm scale
Objective Lens Cover ......................... slip-on metal
PARTS OF YOUR AT 106LE
2" accessory
holder
Lock knob for
lock knob
finder bracket
Lock knob for 360°
Lock knob for focuser
drawtube
Right coarse
focus knob
Fine focus
knob
Your Astro-Tech AT106LE refractor is usable for day and
night viewing, simply by adding a star diagonal, eyepiece, and
mount. Any 1.25" or 2" eyepiece can be used, from a 40mm
for the lowest practical magnification (17x) to a 3.2mm (215x)
for high power observing. A 2" compression ring accessory
holder on the focuser and a separate 1.25" compression ring
accessory holder let you use either 1.25" or 2" star diagonals
and eyepieces with no other adapter needed.
Mounting your AT106LE: A stable altazimuth or
astronomical mount is essential for best viewing with the 11.3
pound AT106LE. Your scope is supplied with 114mm i. d. split
mounting rings and a variety of dovetail plates are available
....... 1.09 arc seconds
.............................. 229x
Lock knobs for
focuser rotation
Retractable
dew shield
from Astronomy Technologies
This instruction sheet will help you get the most out of your
new refractor so you can enjoy a lifetime of high-performance
observing and imaging.
Please familiarize yourself with your telescope's parts and
functions before using it for the first time.
Finder ...... none; mounting shoe provided for optional
Astro-Tech multiple reticle finder or similar finder
Dew Shield .............. retractable, with two lock knobs
Dew Shield Diameter ......................... 145mm o. d.
Tube Diameter .................................... 114mm o. d.
Tube Length
Tube Length
Tube Weight ................................ 9.8 lbs. (4.45 kg)
Tube Weight
Case ...... 10 lb. (4.55 kg) aluminum-frame foam-fitted
Case Dimensions ......................... 26" x 10.5" x 8.5"
Lowest Usable Power ............ 17x (40mm eyepiece)
Highest Terrestrial Power ....... 98x (7mm eyepiece)
Highest Practical Power ........ 172x (4mm eyepiece)
Theoretical Maximum ........ 215x (3.2mm eyepiece)
Lock knob for 360°
focuser rotation
Mounting bracket for
optional finder
Focusing scale on
dew shield
focuser drawtube
Left coarse
focus knob
1.25" accessory
lock knob
accessory
holder
from your Astro-Tech dealer for installing your AT106LE on
the mount of your choice.
Astronomical observing: The theoretical maximum usable
power available from your AT106LE is 215x, although this
requires a 3.2mm eyepiece that provides a very narrow and
dim 0.49mm diameter exit pupil. Still higher powers are within
your scope's capabilities, but require truly excellent seeing
conditions and the patience to wait for those conditions to
make their brief and infrequent appearances.
A more practical maximum magnification for astronomical
viewing with your AT106LE would be 172x, using a 4mm
eyepiece.
(lens shade retracted)
(lens shade extended)
............... 11.3 lbs. (5.14 kg)
(with rings)
lockable hard case, with carrying handle
compression
1.25"
2" accessory
holder
......... 23" (584mm)
..... 26.5" (673mm)
Fine
focus
knob
Right
coarse
focus
knob
Brass
ring
2" accessory
holder lock knob