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No it is not coma, it is a combination of field curvature and slight main mirror misalignment. I am going to realign the main mirror and get rid of the field curvature with a Hutech focal reducer/field flattener.
The Canon 5DH is a fullframe (25X36mm) camera so any field curvature becomes more noticeable. We have all been lulled into a false sense of optic quality by the smaller sensor sizes which only see the 'good' inner 'flat' part of the image.
Bert
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