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You sure you don't have ANY vignetting? If you take a flat frame and stretch it, do you really have completely uniform brightness across the entire image? If not, then you probably need flats. Kstars/Ekos has an automated flat capture module, so if it is as easy to use as the equivalent feature on NINA, it will only take a few minutes to collect the flat frames, so what's the harm in collecting them...?
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