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You will note that the bright stars in both images have halos. In one
image red, and in the other image, orange. The different coloured halos are the result of the base colours of the two images being very different.
Neither background looks like a reasonably dark site background should
look, so I think your problem is software related, rather than in the
optical train. I obviously have no idea what processing, if any, you did.
raymo
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