Hi all, I've been imaging M31 lately & this example was shot two days ago. It consists of 44 subs at 240 seconds, 30 dark's, 30 flats & 50 bias frames for a total of 2:55 minutes integration time. Stacked in DSS & processed in StarTools with noise reduction.
EQ6-R mount, WO ZS103 scope with Flat./reducer on a Nikon D5600 unmodded.
This is really messed up & maybe some thoughts on whats happening here. As you can see there's really bad reddish banding along the bottom & upper right corner. My theory is #1: The seeing conditions were average but looking at a satellite smoke map there was smoke over my imaging site. #2: Forgot to turn on the dew heaters until I was about 2 hours into my session & it was a dewy evening. #3 Bad calibration frames?
Also, I imaged NGC7000 about 2 weeks prior & processed in the same manner with no problems.
This is not my best processing attempt as I want to emphasize the banding.