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Thanks H & Greg, appreciate your feedback.
Being parfocal is reasonably important, as I typically like to do RGB all on the same night, but I do plan on setting up automated focusing in the near future, at which point it will become less important: I'll probably refocus after every frame anyway, certainly at every filter change.
Greg's comment about expecting halos on brighter stars regardless of maker concerns me; maybe I'm expecting too much.
I'll post up some 100% crops of recent captures and see what you guys think. Maybe this is about as good as it gets and I need to look for a processing solution rather than hardware.
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