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its very interesting the CCD report as you have "inverted" correction that is the stars are becoming less corrected towards the center. remember Black is flat green is bad. with my 10" newtonian its nearly flat in the middle (as it should be) and curves slighty up at the edges but a site load better than without the coma corrector.
Can you take a series of 6 shots on a star field and then average them with ccd stack with and without the corrector that would be a better comparison to the proformance of the corrector.
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