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Your HEQ5 won't give you field rotation; I thought you might have been using an alt/az mount. I know little about reducers/ flatteners, so can't help there. Try an exposure without it; if it goes away you know the reducer is the culprit in some way or another.
It just occurred to me; is it possible that the camera turned a bit during an exposure? Worth looking at the individual frames to see if it appears on one or all of them.
raymo
Last edited by raymo; 25-08-2015 at 12:58 PM.
Reason: more text.
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