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Hi Martin,
Nice subject well done. I see what you mean though, the stars look a little elongated and I believe it’s a tracking issue over and above coma. Coma wouldn’t be as prominent in the middle of the frame, generally most pronounced around the corners however the stars in this image seem affected across the entire frame. I can’t comment on the guiding precision since I don’t run an autguider but I am aware of coma. I have recently lashed out on a corrector and it has fixed up the issue.
Field rotation, well again not an expert but I would have though DSS would have sorted that out.
In saying that, the overall image is quite a sight, like it.
Cheers
Anth
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