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Celestron Omni XLT 150 Manual

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The telescope should also be balanced on the declination axis to prevent any sudden motions when the DEC clamp
(Fig 2-13) is released. To balance the telescope in DEC (all telescopes except the SCT):
1. Release the R.A. clamp and rotate the telescope so that it is on one side of the mount (i.e., as described in the
previous section on balancing the telescope in R.A.).
2. Lock the R.A. clamp to hold the telescope in place.
3. Release the DEC clamp and rotate the telescope until the tube is parallel to the ground (see figure 2-15).
4. Release the tube — GRADUALLY — to see which way it rotates around the declination axis. DO NOT LET
GO OF THE TELESCOPE TUBE COMPLETELY!
5. Loosen the screws that hold the telescope tube inside the mounting rings and slide the telescope either forwards
or backwards until it remains stationary when the DEC clamp is released.
6. Tighten the tube ring screws firmly to hold the telescope in place.
Note: The Omni XLT150R is the most difficult to balance depending on the latitude, the accessories used, and
which part of the sky the telescope is pointing to. Balance this telescope as best you can.
Like the R.A. balance, these are general balance instructions and will reduce undue stress on the mount. When
taking astrophotographs, this balance process should be done for the specific area at which the telescope is pointing.
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In order for a motor drive to track accurately, the telescope’s axis of rotation must be parallel to the Earth’s axis of
rotation, a process known as polar alignment. Polar alignment is achieved NOT by moving the telescope in R.A. or
DEC but by adjusting the mount vertically, which is called altitude, and horizontally, which is called azimuth. This
section simply covers the correct movement of the telescope during the polar alignment process. The actual process
of polar alignment is making the telescope’s axis of rotation parallel to the Earth’s, is described later in this manual
in the section on “Polar Alignment.”
Figure 2-15
Figure 2-14
… 16 …


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