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Hi Carl, I kept out of the last thread because I couldn't see enough of the image to hazard an educated guess. Now that I can see the whole image I would think you have two problems here to cope with. nI suspect the elongation is a field curvature problem and you might find a field flattener of some description might help. The second I suspect is an aligment issue placing the right side of the image out of focus graduating to the outer edge. This may be a mirror flop issue which is fairly normal for small SCT's without mirror locks. I don't know if there is any easy fix for this problem.
Good luck with it.
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