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Old 07-04-2010, 06:55 AM
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multiweb (Marc)
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Join Date: Oct 2007
Location: Hinchinbrook
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Originally Posted by DavidTrap View Post

Are you sure that's not field rotation??? The rotation looks like likes its going round in a circle, rather than out radially from the centre. I agree that you'd be unlucky to get bad rotation in a 2min exposure unless your alignment is WAAAAAAY out...

Very hard to get field rotation on M42 on 3min exposures. Maybe on 15min subs with a real bad polar alignment. That pattern is typical of over correction on the edges i.e. spacing is too big.
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