astro-tech AT80LE
from Astronomy Technologies
Thank you for choosing our Astro-Tech AT80LE high-
performance apochromatic doublet ED refractor.
The images from the AT80LE’s fully-multicoated 480mm
f/6 ED doublet optical system (using premium Ohara glass
Its carbon fiber tube and dew shield are exceptionally and an FPL-53 extra-low dispersion element) are virtually
durable, with excellent thermal characteristics. The dew color-free, even at very high magnifications. We believe
shield is oversized, with a 124mm o.d. compared to the you will find that the visual and photographic performance
80mm lens diameter.
This assures that tube currents, which typically follow
of your AT80LE doublet is little short of remarkable.
This instruction sheet will provide you with information
the walls of a telescope tube, will have a minimal effect on how to get the most out of your new refractor, and
on your images as the AT80LE cools down to ambient how to properly maintain your scope so it can give you a
temperature. You can begin serious observing with an lifetime of observing enjoyment.
AT80LE sooner than you can with an aluminum tube
80mm doublet with a conventional dew shield design.
Please familiarize yourself with your telescope’s parts
and functions before operating it for the first time.
PARTS OF THE AT80LE
Retractable
dew shield
Mounting points for
optional finder
Fine
focus
knob
Dew shield
lock knob
2” eyepiece
lock knob
Focusing
scales on
focuser
drawtube
Right coarse
focus knob
Left coarse
Fine
1.25”
eyepiece
lock knob
focus knob
focus
knob
90mm split rings,
with 1/4”-20 thread
mounting holes
top and bottom
Lock knob
for focuser
drawtube
Tension
adjustment
knob for
2” eyepiece
holder
Right
coarse
focus
knob
1.25” eyepiece
adapter
focuser drawtube
Dust cover
1.25” eyepiece
lock knob
Brass compression ring
Dust cap
2” eyepiece
lock knob
1.25”
eyepiece
adapter
1.25” eyepiece
lock knob
Astro-Tech AT80LE Refractor Specifications
Aperture.............................................. 80mm (3.1”) Optical Tube Diameter .........................90mm o. d.
Focal Length ...............................................480mm Tube Length (lens shade retracted) ......... 15.5” (394mm)
Focal Ratio ........................................................ f/6 Tube Length (lens shade extended) .......18.75” (476mm)
Objective Type...... doublet using Ohara FPL-53 glass Weight (optical tube only) ..................5.15 lbs. (2.34 kg)
Optical Coatings ........................... fully multicoated
Weight (with rings and 1.25” adapter) ...6.55 lbs. (2.98 kg)
Resolving Power (Dawes’ Limit) ......... 1.45 arc seconds Lens Shade ...retractable carbon fiber, with lock knob
Visual Limiting Magnitude ..............12.0 maximum Objective Lens Cover .........................slip-on metal
Light Grasp (versus the eye) ................................ 131x Mounting Rings ............dual 90mm felt-lined hinged
Field Stops ... 2 glare-reducing baffles in optical tube,
split rings with 1/4”-20 thread mounting holes
one at front of dew shield Case ............................. aluminum-frame foam-fitted
Focuser ............................ dual-speed Crayford-style
lockable hard case, with carrying handle
with 10:1 reduction ratio fine focus; Case Dimensions ............................. 20” x 7.5” x 9”
2” and 1.25” compression ring eyepiece holders Lowest Usable Power............ 12x (40mm eyepiece)
Focuser Travel ............ 2.9” (74mm), with millimeter Highest Terrestrial Power .......80x (6mm eyepiece)
and inch scales on drawtube for repeatable focus Highest Practical Power........ 160x (3mm eyepiece)
Optical Tube Material.......................... carbon fiber Theoretical Maximum ........... 160x (3mm eyepiece)
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