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Thanks Peter,
I do have CCDIS however I find it's KPI's can be misleading. Here are the curvature plots for the two images. This would have you believe the 55mm spacing is flatter and have less tilt than the 61mm however visually the 61mm is clearly flatter.
I must try this on a star field to see if the results tell a different story. In any case the elongated stars in the bottom two corners look a lot better to my eye!
Peter
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