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Yes, a good start and not bad for just 1 hour of data. Collimation may be slightly out as you say. When I lock my adapter / camera in the focuser I check that there are no gaps between the adapter flange and the focuser as/after I tighten the set screws. However, your image looks like a general collimation issue to me - do you use any tools (eg. laser collimator,etc) to align the mirrors?
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