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The Helios-44M-1 58 mm f/ 2.0 (Russian: "Гелиос") is a fast standard lens with a fixed focal length for 35mm cameras with M42 screw mount.
With a special adapter can be attached to modern dSLR and mirrorless cameras.
Pilot production was at "Krasnogorskiy Mehanicheskiy Zavod (KMZ)" factory.