Quote:
Originally Posted by Startrek
Imaging below 30degrees in Alt has a higher risk of unstable guiding due to atmospheric instability but doesn’t generally cause random big excursions in Dec or Ra
Random big excursions in Ra and Dec can be caused by -
Dec and Ra Backlash
Period error in your worm drive
Wind gusts
Cable snags
Passing Cloud
Incorrect Guide Settings ( calibration, guide exposure, min mov etc.. )
If your previous guiding has been ok for a while then on the next clear night try some test guiding on a star in the East up at 50 to 60 degrees and see how the mount performs
Also , if using PHD2 , try the PPEC algorithm and guide for 2 or 3 worm cycles ( 20 mins or so ) to see how the mount performs
Are you using PHD2 ?
If so, are you using Version dev 4 or later with Multistar guiding feature ?
Cheers
Martin
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Attached are some docs I put together a while back on PHD2 guiding
They may be of some assistance moving forward if you use PHD2
Cheers
Martin