Quote:
Originally Posted by Joshua Bunn
Hi Peter,
A couple of differebt things to try. Try a different brighter guide star and recalibrate the guider,
This does sound like your polar alignment could be off - how is the PA? mmmm... but then the Dec graph wouldnt go +ve after it being -ve.
Oscilations in Dec... this does sound like backlash in Dec.
Josh
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Hi Josh, Thanks for your input! My PA is quite good (or it was a few months ago...have not checked for a while) and certainly good enough to expect very good guiding (though maybe not unguided for more than a few minutes. I have re-calibrated numerous times, and guiding does the same thing in DEC at various points in the sky. When I calibrate the mount seems to move correctly and repeatably in DEC, so it's quite confusing as to why this is happening.
Peter