The Jupiter (Russian: Юпитер, "Jupiter") series of lenses are Russian camera lenses made by various manufacturers in the former Soviet Union. They were made to fit many camera types of the time, from pre-WWII rangefinders to almost modern SLRs. They are copied from Zeiss pre-WWII designs with incremental improvements, such as coatings, introduced during production. The majority of them are based on Zeiss Sonnar optical scheme, but that's not a rule.Jupiter-3The Jupiter-3 lens is derived from Zeiss Sonnar optical design. It has seven elements in three groups. This lens is the fastest Jupiter lens, having a maximum aperture of f/1.5. The focal length of this lens is 50mm, sometimes also expressed as 5cm.It was made for two different camera mounts, the Leica thread mount used on Zorki, FED, and some other Soviet rangefinders, and the Contax mount used on Kiev rangefinders. The latter one can be used on all Contax rangefinders, with the former usually needing to be adj
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