Lens Industar-50 50 mm f/ 3.5

Format: 35mm mirror

Type: Fixed focal length (fixed)

Focus: Manual Focus

System: M39.

Year of production start: 1960.

Year of completion of production: 1970.

Optical design: 4 elements in 3 groups, Tessar

Look carefully at the photos, this is the best description of the product!!!