Celestron CR-150 HD - Manual (Page 20)

20 • Telescope Basics
T E L E S C O P E B A S I C S T E L E S C O P E B A S I C S T E L E S C O P E B A S I C S T E L E S C O P E B A S I C S T E L E S C O P E B A S I C S
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 refractor telescopes.
There are several accessories that come standard with all the Celestron refractor
telescopes. The installation and use of each of these is described in this section.
The Star Diagonal The Star Diagonal The Star Diagonal The Star Diagonal 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 accessory adapter 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 accessory adapter (see
figure 4-1).
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.
The Eyepiece The Eyepiece The Eyepiece The Eyepiece The Eyepiece
The eyepiece, or ocular, is an optical element that magnifies the image
focused by the telescope. The eyepiece(s) fits into either the accessory adapter
directly , the star diagonal, or an erect image diagonal (see
Optional Accessories
section). To attach an eyepiece:
1. Loosen the set screw on the star diagonal so that it does not obstruct the
inner diameter of the eyepiece end of the diagonal.
2. Slide the chrome portion of the eyepiece into the star diagonal (see figure
4-1).
3. Tighten the set screw 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 then replace it with another ocular.
Attaching the Attaching the Attaching the Attaching the Attaching the
Accessories
Accessories Accessories Accessories Accessories