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Refractors, Coma, and Field Flattener
Hi guys. I have been doing some imaging with my Vixen ED80. The stars in the corners appear to be affected by coma. I've been doing some reading on the net, some people say refractors suffer from coma, and others don't. I didn't think they did either. Or is it field curvature? Will a flattener correct for it?
Erik
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