Industar-10 Russian collapsible 3.5/50mm lens of FED Leica M39 mount camera 

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Produced for the first rangefinder cameras such as "Zorki" Had a variety of design options, including a folding option, similar to the lens Leitz Elmar (3,5 / 5 cm). At the end of the 1950s was replaced by the scaled, better lens of the same scheme - Industar-50. Focal length of 52 mm (51.39 mm), aperture of 1:3.5, the angle of view 46 °. Number of elements / groups of 4/3, the limits of the aperture scale 1:3,5 - 1:16 Closest focusing distance: rangefinder option - 1.25 m (1 m) for SLR Cameras - 1 m (0.65 m). The resolving power of TU (center / edge): rangefinder folding option - 32/22 lines / mm (according to other sources [101, p 171] - center / edge - 30/19), light transmission 0.80.