Quote:
Originally Posted by pvelez
But I still can't calibrate for declination with PHD which means no autoguiding to fix my lousy polar alignment.
Surely someone else has this problem...
Pete
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Hi Pete,
For my understanding of calibration process it has nothing to do with bad polar alignment. It deals only with a camera position in relation to DEC and RA axes.
With GuideDog you have to rotate a camera manually to calibrate it while in PHD it's an automatic process. During calibration process it calculates the angle between RA and DEC axes and a real position of a camera sensor. When it's done PHD takes this angle into account during autoguiding. Also there is no point in doing calibration for both DEC and RA as they are always 90 degrees to each other. It means that even movement in one direction(left, right, up or down) should be enough to calibrate a camera position.
if your scope isn't aligned properly or suffers from PEs it should be compensated by autoguiding itself.
cheers,
Michael