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Thanks Barry :-)
I've done a diff of the frames now which confirms my earlier thoughts; the stars are a different shape, which I think I can resolve to guiding errors culminating in slighting different shaped stars.
The blue and green also look out of focus compared to the red but even if I got the focus right the stars would be a different shape giving rise to these irritating halos (which of course would be having the same effect on everything, it's just easier to see on the stars).
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