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I re-painted the inside of my 12" tube and added an A4 square of self adhesive felt behind the secondary and also added some baffles just above the primary.
to me it seemed to improve the contrast quite a bit visually but id say its pretty subjective, some people swear by flocking and baffling the whole tube and focuser and others dont think it makes any difference at all.
i think its worth it anyway, especially if you are already taking the mirrors out for a clean
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