Arsenal Jupiter-12 2,8/3,5cm for Kiev / Contax. Prime lens

USSR lens: Jupiter-12. Contax-Киев RF mount. For cameras Kyiv and Contax.

Functionality: the lens is working - the lens elements are clean, focusing operation is smooth and easy. The diaphragm blades are dry and free of excess lubrication. The operation of the diaphragm is smooth and easy

'JUPITER-12' would be copied from the German Carl Zeiis Jena Biogon 1: 2.8 f = 3.5cm. The first lenses were produced from German blanks; later the lens was converted to the domestic grade of optical glass. 'JUPITER-12' is the most common Soviet wide-angle lens for rangefinder cameras.
The JUPITER-12 2.8/35 is interesting primarily because it is not a retrofocus wide-angle lens. The distance from the back element to the focal plane is much less than its focal length. All lenses for full-format cameras with a focal length of less than 40 mm are retrofocal. It is believed that non-retrofocus lenses, such as this JUPITER-12 2.8/35, have certain advantages: compact size and a fairly simple optical design.
The depth of field scale is available for values F/2.8, 4, 5.6, 8, 11, 16, 22. The depth of field for F/22 is so large, and the travel of the focusing ring is so small that the depth of field range at this value occupies almost the entire frame of the body - two marks for F/22 they are side by side.

The diaphragm is adjusted by the inner ring. The aperture ring sets any value from F/2.8 to F/22. The aperture value scale is indicated for F/2.8, 4, 5.6, 8, 11, 16, 22. The aperture consists of only five blades. The diameter of the front filter is small - 40.5 mm, this diameter is used by all common lenses with a Contax-Kiev RF mount. The lens cover is plastic, fits tightly to the body frame, but does not have latches; such a cover is very easy to lose. The cover can be installed on top of the filter.


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