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Nicely done! this and the sombrero are my 2 favourite galaxies. On the Canon point, my 600D was best in iso 400, 800 at a stretch.
on the satellite trails in images, what i do is a median stack on all my shots, that way, any stray satellite streaks and cosmic rays are completely eliminated rather than muted. if you use a mean stack, the high values of satellite trails will always impact the final product and when you try to stretch the data it can show up. just my 2 cents worth. i haven't used DSS in a while, i am not sure if they provide that option.
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