Celestron CR-150 HD User Manual download pdf (Page 16)

16 • The CR-150 HD

To eliminate undue stress on the mount, the telescope should be properly balanced

around the polar axis. In addition, proper balancing is crucial for accurate tracking if

using an optional motor drive. To balance the mount:

1. Release the R.A. Clamp and position the telescope off to one side of the

mount (make sure that the balance bracket thumbscrew is tight). The

counterweight bar will extend horizontally on the opposite side of the

mount (see figure 2-9).

2. Release the telescope —

GRADUALLYGRADUALLY

GRADUALLY — to see which way the telescope

“rolls.”

3. Loosen the set screw on one or both counterweights.

4. Move the counterweights to a point where they balance the telescope (i.e.,

it remains stationary when the R.A. clamp is released).

5. Tighten the set screw to hold the counterweight(s) in place.

These are general balance instructions and will reduce undue stress on the

mount. When taking astrophotos, this balance process should be done for the

specific area at which the telescope is pointing.

Figure 2-9Figure 2-9

Figure 2-9

The telescope should be balanced after all the standard accessories (i.e., star diagonal,

eyepiece, etc.) have been attached to the telescope. The correct procedure for attaching

these accessories is discussed in the section on “Telescope Basics.”

Balancing the TelescopeBalancing the Telescope

Balancing the Telescope

in R.A.in R.A.

in R.A.

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Celestron CR-150 HD User Manual Page 16