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Marc - I dont think its field rotation, as the direction of the star elongation seems to point from the outter edge of the field, into the center... This is either coma or curvature. if it were rotation, the stars would all be smeared in the same direction encircling the guide star.
Maybe under-correction? I dont know for sure, but when I used an MPCC at the wrong distance from my Starshoot Pro, the stars looked much like those in the images shown...
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