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I think you e got a couple of things going on here not just one. The left of the image looks like classic coma but quite extreme. The center of the image seems to be just left of M43 but then the egginess of the stars then changes to a single direction to the top and bottom of frame but with round stars in the center. I think it’s likely to be a combination of tilt and collimation or maybe collimation that far out it’s stopping the coma corrector from being able to correct the field ? It is a strange one to diagnose especially down to one thing.
Cheers
Ryan
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