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I think the problem can be corrected somewhat with a minus violet filter.
They cut out the unwanted wavelengths which cause stars to bloat.
I've ordered one from Lumicon to help with my wide field shots.
This is a quick attempt through a 200mm, as you can see not polar aligned and some flaring but it shows that stars tend to bloat even with high end lenses.
I'll see what the minus v filter achieves and let you know but I suspect it will help a lot in your scope too David.
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