Jupiter-12 35mm f/2.8 Lens – Soviet – Contax/Kiev RF Mount – Tested – Clean Optics

Description
The Jupiter-12 35mm f/2.8 is a Soviet wide-angle lens designed for Contax/Kiev rangefinder cameras, produced from the 1950s through the 1980s. It’s a direct copy of the legendary Zeiss Biogon 35mm f/2.8, known for its sharpness and minimal distortion. With its deep-set front element and protruding rear group, the Jupiter-12 delivers excellent edge-to-edge resolution and a classic rendering style. A true Cold War-era optical gem, ideal for collectors and rangefinder enthusiasts.

Condition

• Optics: Clean – no haze, fungus or scratches
• Body: Light cosmetic wear consistent with age
• Aperture blades: Snappy and oil-free
• Focus ring: Smooth and uniform
• Mount: Contax/Kiev RF bayonet – clean and secure
• Rear element: Intact – no damage or coating loss

Included

• Jupiter-12 35mm f/2.8 lens (Contax/Kiev mount)
• Front and rear lens caps
• Case 

Collector’s Notes
The Jupiter-12 is a Soviet clone of the prewar Zeiss Biogon, built with 6 elements in 4 groups and a unique optical layout that places the rear element deep into the camera body. This design demands precise alignment and is only compatible with Contax/Kiev RF bodies—not interchangeable with Leica thread mount versions. Its quirky aperture ring surrounds the front element and doubles as a filter thread (M40.5×0.5mm). Performance varies by sample, but good copies offer impressive sharpness and vintage character.

Key Features

• Focal length: 35mm
• Aperture range: f/2.8 to f/22
• Mount: Contax/Kiev RF bayonet
• Optical formula: 6 elements in 4 groups
• Minimum focus distance: ~0.9m
• Filter thread: M40.5×0.5mm
• Manual focus with clickless aperture ring
• Made in USSR

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