This is a rare rigid version of a well-known Industar-22 lens. I was made in small quantities in the early 1950's and was sold with export models of Zorki. Optically it is identical to the collapsible Industar-22, but has a unique mechanical design.

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Technical Characteristics:

Focal length: 50mm
Aperture settings: from 3.5 to 16
Angle of Coverage (35mm film): 45°
Focusing: 1m - Infinity
Filter size: 36mm slip-on type
Optical Design: 4 elements in 3 groups, click to see drawing
Optical registration (back focus): 28.8± 0.02mm
Mount: M39x1mm. The lens mounts and RF couples with any Leica or Leica copy (FED, Zorki etc.)
Glass: Coated
Finish: Polished aluminum, matte chrome

(source: fedka.com)

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Measured weight: 94g

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(serial #5203599, Jacques M. coll.)

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