Rob that's a beautiful shot !
My only suggestion would be to lift the black point slightly to brighten the background.
Quote:
Originally Posted by Astrod00d
I think the halo is a reflection off the QHY8 UV/IR filter, in turn being reflected back off the telescope objective. It's only an issue in extremely high contrast situations, such as this one with the bright star in amongst diffuse objects.
... does anyone here have any advice?
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I agree, it looks like internal reflection off the camera filter.
Probably try reducing your subs if there's high contrast objects.