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Stephane
Gee you love a challenge, taking on a tiny dim 9.5 magnitude spiral galaxy , good on you
Well done !!!
A few observations -
1/ Moon is half phase at the moment and disappears on the western horizon around midnight. Did you image this galaxy after midnight or before ? If before the moon glare even at half phase will add some nasty gradients which are hard to mitigate
2/ Try to take new flats for each image session , it’s worth the effort. Darks and Bias you can reuse masters
3/ Stars are a slightly eggy or elongated across the field so either you have a bit of tilt in your camera at the focuser , possibly your polar alignment error is too large causing a bit of frame shift across the field. They appear to be worse on the right hand side. It could also be a bit of coma but I don’t think so as in the left side corners the stars appear to be fairly round. Tight guiding won’t eliminate these issues.
4/ Can’t help you on the post processing side of things as I don’t use PI or Lightroom
Overall a great first attempt
Your definitely heading the right direction and have made great progress in the hobby in such a short time
Clear Skies
Martin
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