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Thanks for the info Brian. Yes, I believe most of the latest quality dielectric coated diagonals are very very good but is this still the best choice for a f10 SCT? Aren't many refractors quite fast regards too focal ratio? From what I understand, scopes below around f8 work best with mirror diagonals and scopes above f8 are better off with a good prism diagonal or maybe there is little difference between the two?
Still confused
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