Celestron CR-150 HD - Manual (Page 12)

12 • The CR-150 HD
Attaching the R.A. Slow Motion Knob
With the mount securely in place, you are ready to attach some of the accessories
(the telescope tube will be added last). Start with the Right Ascension (R.A.) slow
motion knob. The R.A. slow motion knob allows you to make fine pointing adjust-
ments in the direction the telescope is aiming (once it is attached to the mount). To
install the knob:
1. Locate the hard plastic shell under the R.A. shafts.
2. Remove either of the two oval tabs by pulling tightly.
3. Line up the flat area on the inner portion of the R.A. slow motion knob with
the flat area on the R.A. shaft.
4. Slide the R.A. slow motion knob onto the R.A. shaft.
The knob is a tension fit, so sliding it on holds it in place. As mentioned
above, there are two R.A. shafts, one on either side of the mount. It makes no
difference which shaft you use since both work the same. Use whichever one
you find more convenient. If, after a few observing sessions, you find the R.A.
slow motion knob is more accessible from the other side, pull firmly to remove
the knob, then install it on the opposite side.
Figure 2-5 Figure 2-5 Figure 2-5 Figure 2-5 Figure 2-5
Telescope
Mounting Screw
DEC Lock
Lever
RA Lock
Lever
Mounting Platform
DEC Slow Motion
Knob
Altitude Adjustment
Control
Polar Housing
Cover
Azimuth Adjustment
Controls
Declination Setting
C i r c l e
R.A. Slow Motion
Knob
Mounting Platform
Safety Screw
R.A. Setting
C i r c l e