Hi Andrew,
looks good.
An ASA DDM85- & an ASA 1.8x Barlow/flattener - you've moved up in the world!
The halos look good & just mean that the star is blue.
If you want to make such stars all blue it's easy in Photoshop.
Fitswork4 might remove the halos but I doubt it.
If you add noise & blur to the dark background in various amounts in the RGB channels then you'll smooth it out.
You could also use a blurred layer mask to get more contrast & sharpness in just the core.
cheers
Allan
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