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I wish I knew more about the optical path so I could offer some better thoughts, mate.
(Here's some pure conjecture, in case you're interested) I am going to go out on a limb and say/guess the source of the donuts is the same for with and without coma corrector and not on your sensor. I reckon the movement of the donuts is due to the correction effect of the coma corrector. Hows the secondary lookin?
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