L L L L L Telescope Basics; Attaching The Accessories; The Visual Back; The Star Diagonal - Celestron The G-8 11023 Instruction Manual

T E L E S C O P E
Attaching the
Accessories
20 • Telescope Basics
Once your telescope has been fully assembled, you are ready to attach the
accessories and have a look. This section deals with basic telescope opera-
tions that are common to all Celestron 8 telescopes.
There are several accessories that come standard with all the Celestron 8
telescopes. The installation and use of each of these is described in this
section.

The Visual Back

The visual back is the accessory that allows you to attach all visual accesso-
ries to the telescope. The G-8, and the C8 Optical Tube come with the visual
back installed. If it is not already on the tube it can be attached as follows:
1. Remove the rubber cover on the rear cell.
2. Place the knurled slip ring on the visual back over the threads on the rear
cell (see figure 4-2).
3. Hold the visual back with the set screw in a convenient position and rotate
the knurled slip ring clockwise until tight.
Once this is done, you are ready to attach other accessories, such as eye-
pieces, diagonal prisms, etc.
If you want to remove the visual back, rotate the slip ring counterclockwise until
it is free of the rear cell.

The Star Diagonal

The star diagonal uses a mirror that reflects the light at a right angle to the light
path of the telescope. This allows you to observe in positions that are physi-
cally more comfortable than if you were to look straight through. To attach the
star diagonal:
1. Turn the set screw on the visual back until it no longer extends into (i.e.,
obstructs) its inner diameter of the visual back.
2. Slide the chrome portion of the star diagonal into the visual back (see
figure 4-2).
3. Tighten the set screw 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.
B A S I C S