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Celestron Advanced VX Manual

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32 I
4. Plug the autoguider cable into the autoguider port on the
mount’s electronics panel.
5. To begin recording the drive’s periodic error, press the
MENU button and select PEC from the Utilities menu.
Use the Up/Down scroll buttons to display the Record
option and press ENTER. When you are ready to record,
press the ENTER button again to begin. You will have
5 seconds before the system starts to record. The first
time each observing session that PEC record or play is
selected, the worm gear must rotate in order to mark its
starting position. If the worm gear rotation moves your
guide star outside the field of view of the eyepiece, it will
have to be re-centered before the recording begins.
Note: Once the worm gear is indexed, it will not need to
be positioned again until the telescope is turned off. To give
yourself more time to prepare for guiding, it may be necessary
to restart PEC recording after the worm gear has found its
index.
6. After 10 minutes, PEC will automatically stop recording.
7. Point the telescope at the object you want to image and
center the guide star on the illuminated cross hairs. You
are ready to play back the periodic error correction.
8. Once the drive’s periodic error has been recorded, use
the Playback function to begin playing back the correction
for future imaging guiding. If you want to re-record the
periodic error, select Record and repeat the recording
processes again. The previously recorded information
will be replaced with the current information. Repeat
steps 7 and 8 to playback the PEC corrections for your
next object.
Does the PEC function make unguided astroimaging
possible? Yes and no. For solar (filtered), lunar and piggy-
back (up to 200 mm), the answer is yes. However, even
with PEC, autoguiding is still mandatory for long exposure,
deep sky astroimaging.
… 32 …


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