Well, I think I learned the hard way that you should take flats at the beginning of each session. I setup tonight to continue to take more subexposures of M101 and for some reason the field is turned about 30 degrees! I can't figure out how it happened.
Rotating the focuser presents a problem: the defects that the flat will correct (spots on the lens and the sensor) are partially unique to the orientation of the camera. So, if I take flats now, some of the flat data will incorrectly correct for defects that are about 30 degrees off. This will be interesting as I will need a week before I get to the data.
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