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The FSQ-85 definitely wasn't meant for this size sensor (3900x2616) natively, so yes, there is absoutely field curvature (equally) in all 4 corners. I may just get the new FSQ85 flattener (for larger sensors) to rectify that.
I am concerned though there may be a camera issue. Cooling was running -20°steady all night, and individual non-debayered frames appear fairly evenly illuminated. It doesn't matter in PI or CCDStack if I specify a particular bayer mosaic or if I let the program decide.
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