The Industar is a series of Soviet lenses based on pre-war Zeiss Tessar designs, produced at various Soviet optical factories from the 1940s onwards. The Tessar formula — four elements in three groups — was known as the “Eagle Eye” for its sharpness. Industar lenses are compact, well built and produce clean, sharp images with a slightly clinical rendering quite different from the Helios. An excellent lens for street and documentary photography.