Quote:
Originally Posted by DavidTrap
Mick,
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...
DT
|
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.