Orion ED TRIPLET CARBON FIBER APOCHROMATIC REFRACTORS ED80T CF #9534 - Manual (Page 3)

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Congratulations on your purchase of an Orion ED
Triplet Carbon Fiber Refractor. Your telescope has
been designed with high quality precision optics
and excellent mechanical construction. The dual-
speed (11:1) Crayford focuser will make getting
sharp images a breeze and reduce image shift
to almost zero. The three element objective lens
offers excellent color correction. These instructions
will help you set up and use your telescope.
Parts List
ED80T CF
Optical tube assembly
Threaded metal objective cap
1.25" eyepiece adapter
5mm hex key
Hard carrying case
ED102T CF
Optical tube assembly
Threaded metal objective cap
1.25" eyepiece adapter
Tube rings
Dovetail mounting plate
4mm hex key
Getting Started
The ED Triplet Carbon Fiber (ED T CF) refractors come fully
assembled from the factory. The telescope’s optics have been
assembled and collimated at the factory, so you should not
have to make any adjustments to them.
Please keep the original shipping box. In the unlikely event
you need to ship the telescope back to Orion for warranty
repair service, you should use the original packaging. The box
also makes a very good container for storing the telescope
when it is not in use.
Functions and Features
The ED T CF refractors have several features designed to
maximize the use and enjoyment of your telescope. When you
have become familiar with all of the functions of your ED T CF
refractor, you will be ready to begin using your new telescope
under the night sky!
Retractable Dew Shield
All ED T CF refractors feature a retractable dew shield (Figure
1.1-1.2) which allows the telescope to become more compact
for storage. The dew shield’s primary purpose is to prevent
dew (water condensation) from forming on the lens during
cold and humid nights. The dew shield is also useful for reduc-
ing glare under unwanted outside lights. To extend the dew
shield, remove the optical tube dust cover by unthreading it
counter clockwise, then loosen the dew shield lock thumb-
screw. Pull the dew shield outward until it stops and retighten
the dew shield lock thumbscrew.
Dual-Speed Crayford Focuser
The ED T CF refractors come equipped with dual-speed
Crayford focuser (2" for the ED80T CF and 3" for the
ED102CF). The Crayford design allows for smooth, precise
focusing without the image shift that rack-and-pinion designs
experience.
For quick focusing of your ED T CF refractor, the two larger
silver focus knobs will provide a coarse focus. For more pre-
cise focusing, as needed for applications such as critical high
power planetary observing and digital imaging, the smaller
black focus knob (Figure 1.1-1.2) offers fine focus adjust-
ment. The fine focus knob rotates eleven times to one single
rotation of the coarse focus knobs, making an 11:1 ratio for
extremely precise focusing.
If you find that the focus adjustment is too hard to turn or if the
drawtube slips under the weight of your eyepiece or camera,
you can make adjustments to the focuser tension by using the
focuser tension set screw located on the bottom side of the
focuser (Figure 2). Make adjustments to this set screw until
the focuser motion feels smooth and holds in place when you
have obtained focus. It may be necessary to make adjustments
when the weight of your accessories change significantly.
Figure 2. Locate the focuser tension set screw to change the
tension for heavier loads.
Focuser lock
thumbscrew
Focuser
tension
setscrew