Quote Originally Posted by geraldatwork
The Jupiter 35/2.8 is a really nice lens. But it has a large rear element that might get in the way of the light meter. There is probably info about this on the web. If it is no problem they are about $50 (US) and are better than the Leica Summaron 3.5.
I asked Stephen Gandy (Voigtlander Dealer) Stephen Gandy <leicanikon@earthlink.net about Jupiter 12 2.8/35mm compatibility with the Voigtlander R and R2:

"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."