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Davo,
I am in line with Itchy. The "Flat" will only alleviate the vignetting (and dust motres if there are any) within the optical system. Maybe try one (it can be any flat lit subject like a wall or T shirt), and also try a few darks to get rid of any hot pixels. I would be happy with what you have as well though.
I suspect a slight amount of off focus, but all in all, a ripper.
Point it up when it is real dark.
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