Roman, please check the other responses in this thread.

I asked Stephen Gandy (Bessa/Voightlander Dealer):

"Is it possible to use the Russian Jupiter 12 f2.8 35mm lens on either the Voightlander 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."