F2.8/52mm

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Industar-61  - Four-glass anastigmat average luminosity with coated optics. Equipped with iris. In addition to the KMZ produced Lytkarino Optical Glass (LZOS) Industar-61L, 2.8 / 52 - for rangefinder cameras (M39x1/28, 8), and Kharkov factory FED: Industar-61 (I-61) 2.8 / 52 , Industar-61L / D 2,8 / 53, 2,8 / 55 - for rangefinder cameras in the technical data and on the focal length of the lenses themselves indicated as 50 mm, 52 mm, 53 mm or even 55 mm.
Focal length of 50 mm (52.42 mm), aperture 1:2.8, the angle of view 46 °, frame size 24x36 mm. Number of elements / groups of 4/3. The limits of aperture scale - 1:2,8-1:16. The resolving power of TU (center / edge): 45/28 lp / mm (according to other sources [101, page 171] for option LZ - center / edge - 40/27), transmission factor of 0.85. The formula color: 11-0-1,5.