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A N   E M P L O Y E E - O W N E D   C O M P A N Y

Orion

®

 High-Reflectivity Mirror Star 

Diagonals

#8727  2" version w/dielectric coatings

#8879  1.25" version w/enhanced aluminum coatings

#8880  1.25" version w/dielectric coatings

Congratulations on your purchase of a high-quality Orion star diagonal. Your diagonal utilizes a 
precision flat mirror with high-reflectivity coatings and top quality machined housings. Using a star 
diagonal with your telescope provides a comfortable viewing angle for astronomical observation.  
In addition, a diagonal is required to reach focus in many short-focal length refractors. The diago-
nal will work with refractors, Schmidt-Cassegrains, and Maksutov-Cassegrains, but not Newtonian 
reflector telescopes.

How to Use the Star Diagonal

Remove the cover caps and place the barrel of the star diagonal directly into the telescope’s 
focuser. Secure it in place with the thumbscrew(s) on the focuser. Insert your eyepiece into the 
of the diagonal and secure the eyepiece with the diagonal’s thumbscrew. Notice there is a brass 
compression ring inside the opening of the diagonal, interior to the thumbscrew. This ring prevents 
the thumbscrew from marring the barrel of your eyepiece. 
If you would like to adjust the position of the diagonal to accommodate observers of different 
heights, simply loosen the thumbscrew(s) on your telescope’s focuser, rotate the diagonal, and 
re-secure your telescope’s thumbscrew(s). Before rotating the diagonal, however, make sure the 
thumbscrew on the diagonal is tightened, or the eyepiece may fall out and onto the ground!
The 2" star diagonal will accept either 2" or 1.25" eyepieces using the supplied 1.25" eyepiece 
adapter. If using 2" eyepieces, remove the 1.25" adapter from the diagonal.

Focusing

Focus with your telescope’s focusing knob. The 1.25" diagonal requires approximately 9cm inward 
focus travel relative to the eyepiece’s focus position without the diagonal. The 2" model will require 
slightly more inward focus travel, as it requires approximately 11cm relative to the eyepiece’s focus 
position without the diagonal. 

The Orion 2" High Reflectivity Mirror Star Diagonal 

Thumbscrews

Barrel

1.25" Eyepiece adapter

The Orion 1.25" High Reflectivity Mirror Star Diagonal 

Brass compression ring

Thumbscrew

Barrel

 Brass compression rings

INSTRUCTION MANUAL

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IN 278 Rev B 01/09

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