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Nathan, you might want to think about the possibility of stray light in the obs. For example, if you look at the focuser drawtube - there is a gap between the tube and the focuser body - so someone sitting with a headlamp on reading his collection of Batman comics while the scope takes calibration shots could well be shining right up the side of the focuser tube. I've done it myself. Or it could be an overbright LED on some piece of equipment. Have a critical look at all lights in the obs - however small. And tape over any that are more cosmetic than functional.
Peter
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