I have a relatively simple question. I know on a 4x5 it is recommended that the bellows length = twice the lens focal length for a 1:1 reproduction with a standard lens (not telephoto design) May I follow this rule for 8x10 as well? i.e. for 1:1 on 8x10 with a 12" lens I need at least 24" of extension. Furthermore, is there a formula I can follow that will provide me with a rough estimate of the closest focus distance (in feet) with a known lens length and a known bellows extension length combination?
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