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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

Summary of Contents for ED102T CF

Page 1: ...ail support telescope com Corporate Offices 831 763 7000 89 Hangar Way Watsonville CA 95076 2011 Orion Telescopes Binoculars Orion ED Triplet Carbon Fiber Apochromatic Refractors ED80T CF 9534 ED102T...

Page 2: ...mbscrew 2 Accessory thumbscrew 2 Accessory thumbscrew Focuser rotation lock thumbscrew Tube rings Fine focus knob Fine focus knob Course focus knob Course focus knob 1 4 20 Mounting block Figure 1 1 T...

Page 3: ...ecome 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 g...

Page 4: ...piece To attach a 1 25 diagonal or extension tube to your telescope 1 Remove the dust cap from the 1 25 eyepiece adapter 2 Insert the barrel of your diagonal or extension tube into the 1 25 eyepiece a...

Page 5: ...ing the ED102T CF can be achieved by sliding the dovetail mounting plate forward or backward within the mount s dovetail holder You can also move the telescope for ward or backward within the tube rin...

Page 6: ...e opening Keep the telescope inside its packaging when not in use Store it indoors or in a dry garage Do not leave the telescope outside except when using it If a scratch appears on the tube it will n...

Page 7: ...les Mounting 1 4 20 mounting block and dovetail plate Weight 2 7 kg 6 lbs Length 37 8cm 14 9 with dew shield retracted ED102T CF Apochromatic Refractor Optical tube Carbon Fiber Objective lens Apochro...

Page 8: ...Orion Warranty Repair 89 Hangar Way Watsonville CA 95076 Proof of purchase such as a copy of the original receipt is required This warranty does not apply if in Orion s judgment the instrument has be...

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