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Hi Peter,
I wouldn't worry about the curavture in the GSO RC. Judging by Paul's images it simply is not an issue. Any RC has curvature. I had a 12.5 inch RCOS and it had curvature and you can buy a special field flattener for it for US$1500. Is it worth it? No. But there is some minor improvement mainly to the star sizes off axis.
Greg.
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