fotostevia
Jupiter-12 + R3M + Amedeo
Just to prove it can be done. Conventional wisdom along with the compatibility guide for my Amedeo adapter is that the Soviet-made Jupiter-12 35/2.8 along with its cousin, the Zeiss Biogon 35/2.8, is broadly incompatible with Voigtländer Bessa rangefinder bodies. There are even a few fairly very scary photos of the large rear element firmly ground against the inside of the camera just short of the shutter.
I took this advice strongly at face value until it was suggested to me that it might not be true (thank you Colton Allen). Sure enough, my late production Bessa R3M has cut-out's in the light baffles, top and bottom, that appeared adequate for clearance. A little careful testing in "B" mode proved this to be true, hence this photo. Note that there may still be an issue with earlier production Jupiter-12 and particularly with the Biogon 35mm since that lens has a protective collar around the rear element. There may also still be problems with other Voigtländer models. Test before jamming a lens into that opening. YMMV.
Note: The bulbous rear element does obscure the cell for the light meter, meaning that a hand-held meter must be used. Clearance is very tight to the body casting top and bottom at infinity such that both mounting and removal are best done with the lens at minimum focus distance. I would also add that I would not recommend this trick for regular usage.
Jupiter-12 + R3M + Amedeo
Just to prove it can be done. Conventional wisdom along with the compatibility guide for my Amedeo adapter is that the Soviet-made Jupiter-12 35/2.8 along with its cousin, the Zeiss Biogon 35/2.8, is broadly incompatible with Voigtländer Bessa rangefinder bodies. There are even a few fairly very scary photos of the large rear element firmly ground against the inside of the camera just short of the shutter.
I took this advice strongly at face value until it was suggested to me that it might not be true (thank you Colton Allen). Sure enough, my late production Bessa R3M has cut-out's in the light baffles, top and bottom, that appeared adequate for clearance. A little careful testing in "B" mode proved this to be true, hence this photo. Note that there may still be an issue with earlier production Jupiter-12 and particularly with the Biogon 35mm since that lens has a protective collar around the rear element. There may also still be problems with other Voigtländer models. Test before jamming a lens into that opening. YMMV.
Note: The bulbous rear element does obscure the cell for the light meter, meaning that a hand-held meter must be used. Clearance is very tight to the body casting top and bottom at infinity such that both mounting and removal are best done with the lens at minimum focus distance. I would also add that I would not recommend this trick for regular usage.