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Optical design
| Format: 35mm rangefinder
Type: Prime lens
Focusing: Manual Focus (MF)
Lens mounts: M39, Pentax K, M39 Leica screw-mount (LSM)
First year of production: 1957
Optical design: 6 elements in 4 groups
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Specifications:
| Focal length | Max. aperture | Min. aperture | Blades | Min. Focus (m.) | Filter Ø (mm.) | Weight (gr/oz) | Length (mm/in) |
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| 52mm | f/2.0 | f/22 | 6 | 0.5 | 49 | | |
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Additional information:
The Helios-65 52 mm f/ 2 (Russian: "Гелиос") is a fast standard lens for the 35мм rangefinder and SLR cameras.
It has a single-layer chemical coating.
There were several versions of a Helios-65 for the different systems:
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for the rangefinder cameras with a thread mount M39x1/28.8
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for the SLR cameras with a thread mount M39x1/45.2
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low-end version for ZEINT-4 cameras (Helios-65Ц)
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bayonet mount for the SLR camera Kiev-10 (Helios-65-avtomat), made by "Arsenal" factory in Kiev.
Resolution (center/edge): 35/15 lp/mm
Aperture coeff. (light transition ratio): 0.81
Posted by: dobrun Date of publication: 07.07.2011
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