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Premium 102mm f/7.0 ED refractor
#9012 Optical Tube Assembly
C
ongratulations on your purchase of an Orion Premium
102mm f/7.0 ED refractor optical tube.
Your telescope has been
designed with high quality optics and excellent mechanical con-
struction. The ED glass in the objective lens means you’ll enjoy
images with far less color distortion than those seen in a stan-
dard refractor, and the smooth dual-speed Crayford focuser will
make getting sharp images a breeze. These instructions will
help you set up and use your telescope.
Getting started
The Premium
102mm f/7.0 ED comes fully assembled from
the factory. The telescope’s optics have been installed and col-
limated, 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.
Mounting the telescope
The Premium
102mm ED refractor can be mounted on Orion
equatorial mounts using the included tube rings and dovetail
mounting plate. The dovetail mounting plate connects directly
to the equatorial mount’s dovetail holder. The dovetail holder
has two securing knobs to keep the dovetail plate securely in
place. Be sure to loosen these two knobs prior to connecting
the telescope to the mount. While grasping the telescope firm-
ly, place the dovetail mounting plate into the mount’s dovetail
holder and tighten the clamping knobs to secure the optical
tube.
An equatorial mount is desirable for astronomical viewing
as it allows easy manual and/or motorized electronic track-
ing of celestial objects as the Earth rotates. Setting circles on
equatorial mounts also enable you to locate objects by their
celestial coordinates (right ascension and declination), which
can be found in many observing books and star atlases.
The Premium 102mm ED refractor can also be easily mounted
on altazimuth mounts like the Orion VersaGo which utilizes a
dovetail holder like Orion equatorial mounts. Follow the previ-
ous directions to couple the telescope to the VersaGo mount’s
dovetail holder.
Extendable lens shade
The Premium 102mm ED refractor features an extendable lens
shade that can help prevent dew accumulation on the objec-
tive lens as well as block stray light or glare from entering the
telescope. Once you have mounted the telescope, gently pull
forward on the lens shade to extend it. Be careful to not touch
the objective lens. The lens shade should be retracted during
storage or at times when the telescope is not in use.
Figure 1.
The Premium 102mm f/7.0 ED Refractor optical tube assembly
Extendable lens shade
IN 318 Rev B 02/09
Dovetail mounting plate
Focus wheel
Tube rings
Rotation lock
thumbscrew
Focus lock
thumbscrew
