Excellent result Stephane.
I see you're using advanced processing skills in PixInsight.
Quote:
"The composition of the two images is done through the PixInsightprocess PixelMath.
If we denote by N the image containing only the contribution of
the discrete emission the composition formula is:
N= Hα - Q*(R-med(R))
This formula is a a variation o the original Vicent Peris expression."
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Your image looks like it was an LRGBHa but it's from a color camera.
So - why is it so good?
You have 24 hours integration of 485 frames so
the square root of that is 22 so you have 1/22 of the single frame noise.
That's enabled you to pull those distant galaxies out of the noise
even in a light polluted suburb.
I'm impressed.
thanks
Allan