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the other possibility is that it is a focus effect and that the top left corner is always a little out of focus if the centre is good. Then, if you have a little misfocus in the centre, the top left corner ends up waay out. That might mean that there is a little bit of tilt somewhere in the system.
I think that field rotation is due to PA - not sure that RA rate error will cause the field to rotate - ie mount may be OK.
Last edited by Shiraz; 31-07-2016 at 07:41 PM.
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