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10 | ENGLISH
Precise Polar Alignment
Celestron’s All-Star Polar Alignment allows you to precisely
polar align your mount without using Polaris or a polar axis
finder. This software-assisted polar alignment allows you to
choose a convenient star.
Prerequisite: The CGX-L must first be aligned with a
Two Star, One Star, or Solar System Align.
1. Select a suitable bright star from the NexStar hand
control’s database. Slew the telescope to the star.
2. Press the ALIGN button. Select “Polar Align” then
“Align Mount” from the list.
3. The telescope will then re-slew to the alignment star
and ask you to center it in the eyepiece in order to
“sync” on the star. Press ENTER, center the star with
the arrow keys, then press ALIGN to sync on the star.
4. Press ENTER and the telescope will slew to the
position that the star should be if it were accurately
polar-aligned. At this point, do not use the hand
control to center the star.
5. Use the mount’s altitude and azimuth adjustments
to center the star in the eyepiece.
6. Press the ALIGN button.
The mount is now precisely polar aligned. You may
proceed to use the mount without a new go to alignment.
Motion Range in Mount
Sofware Range
The CGX-L employs software controlled limit sensors which
detect when the mount has nearly reached its mechanical
range limit. Once the mount reaches the sensor, the motor
will decelerate to a stop and a “Limit Switch” warning
message will appear. The mount will no longer slew in the
direction of the limit switch until you reverse directions.
Mechanical Range
The CGX-L uses internal cabling so the mount is designed
not to move more than a certain range. Both axes are
limited by a hard stop built into the mount. This limited
range can also help prevent unintentional interference
between your telescope and the mount or tripod. If for any
reason the mount exceeds the software limit switch (or if
the clutch is unlocked and the mount is manually moved),
the mount will halt at the hard stop.
R.A. limit (Figure 9.1) allows you to track 20º past the
meridian. If you leave the mount unattended while it’s
tracking, it will automatically stop before reaching the
mechanical hard stop. Dec limit (Figure 9.2) contains
enough slew range to reach any portion of the sky.
Figure 9.1 One side of R.A. mechanical limit
Figure 9.2 One side of DEC mechanical limit
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