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While i agree a UV filter will indeed resolve a problem of residual CA associated with the refractor,
i get a sense that the color balance is a bit off in the raw.
Typically, one would go into PS select a few points including one on a star one KNOWS is supposed to be white and another point into an area that should be black
Then adjusting levels for each RGB ensure the white point hits 255 on each (careful dont go past it the number wont go higher than 255 but the impact of stretching the point will continue)
I think you might find the effect less pronounced after doing this
hope this helps
frank
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