Awesome Marc...
My only nitpick would be star diffraction patterns.. I suppose there is nothing you can do about that... However, nobody can deny that for only 20 minutes of exposure, that is utterly insane.. Once you get your flats sorted out you'll be pumping out some ripper shots for sure!
I'm still yet to get the deep Ha surrounds of M42, even in my most recent attempt a year and a half ago, which was 2hrs Ha + 4hrs OSC I just got hints of it, and it was noisy... Yours looks brilliant.
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