Lens of the USSR "Jupiter-3" 1:1,5 F=5cm - M39 with Screw Mount. Optical design "CZJ Sonnar" Functionality: the external condition of the lens is like new, apparently it had been lying around for a long time and was not used for its intended purpose. The objective lenses are clean (one micro speck of dust), visibility through the lens is excellent - without distortion. Focusing is a little tight, as it has not been developed from constant use; the lens appears to have not been used at all. The diaphragm operation is smooth, pleasant, and easy. The diaphragm blades are dry, without excess lubrication. Never in my life have I seen Jupiter-3 in such excellent condition)) Like new!! My best recommendations to the buyer. You will jump with delight))) Jupiter-3 Lens "Jupiter-3" with M39×1/28.8 mount manufactured by KOMZ Replacement super-fast normal lens with coated optics for rangefinder cameras. The recalculation of the original “CZJ Sonnar” 1.5/50 was carried out at KMZ in 1948 by M. D. Maltsev. Produced from 1948 (KMZ) to 1980, at ZOMZ and at the Jupiter plant. Characteristics: Focal length 52 mm Relative opening 1:1.5 Field of view angle 45° Resolution (center/edge) 30/14 lines/mm 7 lenses in 3 groups 13 iris blades Size Ø 48×55 mm Mount M39×1/28.8, Your parcel will be packed as securely as possible by me personally, assuming all possible risks during transportation: falling from hands, pressure from neighboring parcels from above and on the sides, rain, snow and similar force majeure circumstances. You do not pay anything for materials and packaging of goods, packaging material is at my expense, as a bonus.