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Looking at that dark frame, it seems to me that each of those patterns is circular - almost perfect (if incomplete) circles. My guess would be with a light intrusion up the focuser, and bouncing back from the inside surface of the objective. I've found that I have to use gaffer tape to mask off the focuser drawtube on some scopes and some focusers. I'd be looking for any LEDs in the vicinity of the scope/camera.
Peter
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