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Hi Rodney,
Couple of thoughts from me
1. I believe, you mentioned that SGP was used for focusing. Doesn't SGP focus based on field of view? If yes would it be possible for you to focus some other way on a star in the center to check the curvature/tilt?
2. Yet to compare the fits, but from document images QSI image appears to be tighter in the corners compared to ZWO ASI images. Is that the case?
Regards
Raki
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