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Welcome to multi filter processing Bert. Quite a lot of potential. I don't agree about the round stars in the corners. Plenty of tilt and stacking rotation and maybe polar alignment issues yet. You will sort this in time anyway. Once you get guiding you will know for certain what issues are present.
With processing I suggest you get hold of a copy of CCDstack. Very good program for calibration, stacking and combining. Then use something like PS for final processing.
Looks forward to more.
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