my photo blog

This is a photo of a FSU (Former Soviet Union) lens known as the Jupter 12. Its focal length is 35mm, and it has a front ring aperture dial that goes from f2.8 to f22 without any clicks.

It is a copy of a pre WWII Zeiss Biogon 35mm lens. When found in working condition with clear glass, it takes great photos.

The bulging rear element makes it incompatible with some cameras, but the protruding bulging rear element, which gets very close to the film, ensures minimum image distortion in this retrofocus lens design.

This version has an LTM to Leica M adapter installed, and also a 40.5mm front filter on it which also turns the aperture ring in front.