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Concept
Jupiter (lenses)
Summary
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.
The 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 adjusted to properly work on non-Soviet rangefinders using Leica thread mount.
In recent years, a new version of this lens was manufactured by collaboration of the companies Lomography and Zenit. The lens is named Jupiter-3+ and is meant to be used with Leica-style rangefinder cameras (either Leica thread mount or Leica M mount with an adapter), but can also be used with any digital mirrorless camera.
The Jupiter-6 lens is derived from Zeiss Sonnar optical design. The focal length of this lens is 180mm and it has a maximum aperture of f/2.8. The lens is thus a telephoto lens, nowadays usually used for portrait photography.
It's exclusively made for SLR cameras. There are two versions of this lens, namely Jupiter-6 in M39 mount (not to be confused with LTM, this is the SLR version of the mount for early Zenit cameras) and Jupiter-6-2 in M42 mount.
This lens is really big and heavy. It has five elements in three groups. There are rumors that this lens is actually a real Sonnar, even more than the Carl Zeiss Jena Sonnar 2.8 / 180, which is believed to use the redesigned Sonnar optical scheme – Ernostar.
Official source
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