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10
Installing the Star Diagonal
The star diagonal is a prism that diverts the light at a right angle to the light path of the telescope. This allows you to observe
in positions that are physically more comfortable than if you looked straight through. To attach the star diagonal onto a CGE
800, 925 or 1100:
1. Turn the set screw on the visual back until its tip no longer extends into (i.e., obstructs) the inner diameter of the visual back.
2. Slide the chrome portion of the star diagonal into the visual back.
3. Tighten the set screw on the visual back to hold the star diagonal in place.
If you wish to change the orientation of the star diagonal, loosen the set screw on the visual back until the star diagonal
rotates freely. Rotate the diagonal to the desired position and tighten the set screw.
The CGE 1400 comes with a 2" mirror diagonal that attaches directly onto the rear threads of the 14" optical tube. See figure
2-6.
Installing the Eyepiece
The eyepiece, or ocular, is an optical element that magnifies the image focused by the telescope. The eyepiece fits into either
the visual back directly, the star diagonal, or the 2" mirror diagonal. To install an eyepiece:
1. Loosen the set screw on the star diagonal until the tip no longer extends into the inner diameter of the eyepiece end
of the diagonal.
2. Slide the chrome portion of the eyepiece into the star diagonal.
3. Tighten the set screw on the star diagonal to hold the eyepiece in place.
To remove the eyepiece, loosen the set screw on the star diagonal and slide the eyepiece out. You can replace it with another
eyepiece (purchased separately).
NOTE: The 2" mirror diagonal has a 1 1/4" eyepiece adapter to use 1 1/4" eyepieces. You may remove the adapter to use 2"
eyepieces.
Eyepieces are commonly referred to by focal length and barrel diameter. The focal length of each eyepiece is printed on the
eyepiece barrel. The longer the focal length (i.e., the larger the number) the lower the eyepiece power and the shorter the
Eyepiece
Star Dia
g
ona
l
Visual Bac
k
2" thread-on
Mirror Diagonal
2" Barrel
Eyepiece
Figure 2-6
Figure 2-7