I asked Stephen Gandy (Voigtlander Dealer) Stephen Gandy <email@example.com about Jupiter 12 2.8/35mm compatibility with the Voigtlander R and R2:Originally Posted by geraldatwork
"Is it possible to use the Russian Jupiter 12 f2.8 35mm lens on either the Voighlander R or the R2? The Jupiter 12 is a Russian copy of the old Zeiss Biogon and has a large rear element. It was made with a 39mm screw thread mount for Leica-like cameras and with a Contax bayonet mount."
Stephen Gandy's reply:
"Most will not fit. those that do, will block the metering cell."