The only reason to care about the lens to film distance is, (usually), infinity focus, something that isn't the issue in this case.

The Diabolical Dr Z wrote:

Hello,
I'm planning to do some macro experimenting with a reverse-mounted lens. I noticed the adapters are available in 52 and 49 mm diameter versions. If I get the 52 mm version, would I be able to use 49 mm lenses with a filter step-up ring, or would the lens-to-film distance be wrong then (this probably seems a silly question to many, but I really have no clue how all this works).


TIA,
Z.




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I can understand why mankind hasn't given up war. During a war you get to drive tanks through the sides of buildings and shoot foreigners - two things that are usually frowned on during peacetime.
--P.J. O'Rourke





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