INSTRUCTION MANUAL
IN 221 Rev. B 03/09
Orion 80mm f/7.5 ED Refractor
#9895 Optical Tube Assembly
C
ongratulations on your purchase of an Orion 80mm f/7.5 ED
refractor optical tube.
Your 80mm f/7.5 ED has been designed
with high quality optics and excellent mechanical construction.
The ED glass in the objective lens means you’ll enjoy images
with far less color distortion than those seen in a standard
refractor, and the smooth Crayford focuser will make getting
sharp images a breeze. These instructions will help you set up
and use your telescope tube.
Getting Started
The 80mm f/7.5 ED comes fully assembled from the factory.
The telescope’s optics have been installed and collimated, so
you should not have to make any adjustments to them.
Please keep the original shipping box! In the unlikely event
you should need to ship the telescope back to Orion for war-
ranty repair service, you should use the original packaging.
The box also makes a very good container for storing the tele-
scope when it is not in use.
Attaching the Refractor to a Tripod or Mount
The 80mm f/7.5 ED can be attached to a tripod or mount by
the use of the 1/4"-20 mounting block. The 1/4"-20 shaft of a
sturdy camera tripod will thread into the hole on the mounting
block on the underside of the optical tube.
Optional tube rings can also be used to mount the scope to a
telescope mount. Tube rings with an inner diameter of 100mm
(3.9"), such as Orion item #7371, are needed. If you are using
tube rings, you should first attach them to your telescope
mount and then lay the optical tube in the tube rings.
Use of Optional Eyepieces, Diagonal, and Finder
Scope
The 80mm ED does not come with a finder scope, diagonal or
eyepieces in order to grant the user the greatest versatility in
customizing the instrument to suit their tastes. However, cer-
tain rules for using accessories still apply.
Any Orion finder scope with a dovetail bracket can be used
with the 80mm f/7.5 ED. Simply unthread the thumbscrew on
the dovetail mount (Figure) and insert the assembled finder
scope and dovetail bracket. Retighten the thumbscrew. Finder
scopes that do not use a dovetail bracket will need to be
attached by other means.
The 80mm ED can use almost any 1.25" diagonal and eye-
piece. Please note that the telescope will not come to focus
without the use of a diagonal or extension tube. To install
a diagonal, unthread the thumbscrew on the 1.25" adapter
(Figure) until it is flush with the interior of the adapter. Insert
the diagonal or extension tube and secure it with the thumb-
Figure.
The 80mm f/7.5 ED Refractor optical tube assembly
Dew/Glare shield
Machined aluminum lens cell
Finder scope dovetail mount
2" Crayford focuser
1.25" Eyepiece
adapter
Crayford focuser tension
thumbscrew
Focus wheel (2)
1/4"-20 mounting block
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