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The MPCC is primarily a coma corrector but it will significantly flatten your field too. In my measurments I got a 20% improvement on my newtonian in field curvature with the MPCC. Ideally the back of the MPCC (glass surface) should be 55mm +/- 1~2mm from your sensor plane. You can get different spacers to achieve the correct distance that works for you.
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