> Are the 645 and 6x7 lenses interchangeable? > > eg: could I use my 105mm for the 6x7 on a 645?
You need an adaptor to put 6x7 lenses onto the 645, and you lose lens automation. 645 lenses don't project a large enough image circle to cover 6x7, and I don't think the 645 flange to focal plane distance is long enough to allow a 645 lens to work on the 6x7 anyway. William Robb
