After many many months of being “out of it”, I finally got the scope back out last night. For shake-down I setup an auto run on M15 and went to bed.
This morning I’m working in PixInsight to see what I got, ran the lights and flats through the weighted batch processing script, and low and behold the master flat came out rotated around 180 degrees from the master light (I’m only doing the Blue filter subs for the moment while I work out the kinks). I don’t remember ever running into this issue before. If you flip the flat around the dust motes line up perfectly.
Has anyone run into this before? I must have completely reverted to Noob status in last 6 months or so