I don't think the distance is critical. You can reverse-mount lenses on a bellows too, if you like. The further the lens is from the film plane, the larger the magnification.
Jostein Quoting The Diabolical Dr Z <[EMAIL PROTECTED]>: > 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. > > ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.
