The Helios-44M-4 58 mm f/ 2 (Russian: "Гелиос") is a fast standard lens with a fixed focal length for 35mm cameras with M42 screw mount. Was being manufactured at Krasnogorskiy Mehanicheskiy Zavod (factory) and at "Jupiter" factory in Valday. There are modifications with multicoating (labeled "MC") and a chemical single coating. Resulution by a technical passport (center/edge): Helios-44M-4: 38/19 lp/mm MC Helios-44M-4: 41/20 lp/mm Light transition ratio: Helios-44M-4: 0.80 MC Helios-44M-4: 0.85 Color formula: Helios-44M-4: 10-0-1.5 MC Helios-44M-4: 11-0-0 Geometrical vignetting: 58%

The lens is in VERY GOOD condition (see actual pictures). The lens #821951. All are in working condition. The focus and aperture change smoothly. The lens is free of cleaning marks, fingus or dust inside. The lens has tiny scratches which doesn't affect picture quality.