During focusing, the front lens does not rotate, the frame rim only lengthens (by about 1 cm). Aperture and focus rings are metal with ribs and veins for a comfortable grip. The focus ring rotates 220 degrees, the stroke of the ring is smooth. It's a pity, but like many other Soviet lenses, the aperture blades are not blackened, they shine and are covered with oil, which can negatively affect the contrast of the created image. The aperture control ring only allows you to set fixed apertures (see F values in the table above). HELIOS-44M 2/58 has a diaphragm mode switch M/ A, it can be used to select manual or automatic (semi-automatic) iris control (only with cameras that support blinking auto iris). Prices for modern Helios lenses can be found at this link. The cost of such a lens ranges from 10 to 25 cu Screwed into the front filter, marking of the original hood not found. The same optical scheme is used and other modifications Helios / Helios 44 2/58, as well as all modifications of Biotar 2/58. The optical scheme was copied from the Carl Zeiss Jena Biotat 2/58 lens and converted to Soviet optical glass. 'R' mark for infrared operation.į / 2.0 to F / 16.0, adjustable with aperture ring, automatic ' A'or manual' M'aperture control mode.Ġ.55 m, maximum magnification ratio is 1: 7.35 (approximately)Ħ elements in 4 groups. Scale with aperture values for F / 2, 2.8, 4, 5.6, 8, 11, 16 (no intermediate values). Petals matt metal, not blackened.įocusing distance in meters only. At an intermediate value between F / 2 and F / 4, the petals form small jagged polygons. The petals form roughly regular polygons.
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