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I've used both luminance and clear filters and focused. No difference except perhaps clear filters may have fluffier stars due to the UV but I think that shows up in long exposures not in short focus images like 5 secs.
I only ever focus with luminance filters.
At one stage Clear filters were interesting because they let in a tad more light which is good for dim objects like dim galaxies. The downside is your brighter stars will be bloated.
No need for a clear filter.
Greg.
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