RB model, 6×7 coverage, central shutter, filters are back screw, 40.5mm diam. can focus close to 0.257m. Covers 6×8 for sure (with Mamiya electric 6×8 back on modified RB67 pro-S and on Mamiya RB67 pro-SD.
Some years ago I come across an incredible modification of a 37mm mamiya to act as a circular fisheye on 4×5″ view cameras. Along with a marvellous system for cocking the inner shutter. I’d love to chat with the inventor of this beauty.
I’m looking forward to some info on this lens history. First of all the exact market introduction date…
