Late last year I had a go at M33. Today I did a reprocess of the limited data that I have got right now.
Both times I couldn't get the PI's PhotometricColorCalibration to work. Nothing I seemed to do to tweak the params could get the stars to match properly (I'm sure I had the focal length and pixel size close to correct). So, anyone got any tips? I'd like to make the colour on this closer to "correct" as I can.
Astrobin (details, better pic, etc):
https://astrob.in/lwqtpr/B/
