There is a very large number of lenses known under the general name 'Helios-81'. After the collapse of the USSR, the Arsenal plant (on the territory of Ukraine) continued to produce “Soviet” lenses, but changed their designation to ARSAT. Thus, many Soviet lenses have two names.
Arsat H 1: 2 50mm or MS Helios-81H 2/50
They say that Arsat H 1: 2 50mm - this is just another name for the legendary lens MS Helios-81H 2/50. In practice, this is not entirely true.
Different names
Here are the lens differences:
1. Arsat H 1: 2 50mm has a rubberized focus ring, MS Helios-81H 2/50 has a metal focus ring
Focus ring
2. Arsat H 1: 2 50mm is an AI lens for Nikon cameras. MS Helios-81H 2/50 is something remotely reminiscent of an AI lens. My MS Helios-81H 2/50 has the ability to transfer the aperture value to the camera through the aperture rheostat, but with its skirt rests on the lever EE cameras Nikon D100, D50, D70, D70s, D80, D90... This means that Arsat H 1: 2 50mm can be installed on any Nikon CZK, and MC Helios-81H 2/50 cannot be installed on 6 cameras, without first “filing” the skirt at the point of contact with the EE lever. For details about the diaphragm rheostat and the EE lever, see the section AI-S. I want to note that the protrusion Arsat H 1: 2 50mm doesn't reach the EE lever on my camera Nikon D80.
Different diaphragm ring. The Arsat ring has a shoulder for the EE lever and a different diaphragm ring design.
3. The lenses have different diaphragm blacking. At Arsat H 1: 2 50mm aperture blades are blackened much better than MS Helios-81H 2/50. Diaphragm blackening affects the reflection of light when shooting on closed diaphragms.
Lens aperture blades
4. Different years of release. Logical that the lenses Arsat H 1: 2 50mm newer, which increases the chances of their normal preservation.
Year of construction
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Conclusions:
When I compared the lenses, I did not notice the difference in image quality between the two lenses. But Arsat H 1: 2 50mm outperforms MS Helios-81H 2/50 rubberized focus ring, the ability to mount on all Nikon cameras and the best blackening of the aperture blades.
According provided by Arsat H 1: 2 50mm lens huge thanks Alex de Kairoy.
Familiarity with the Soviet Helios brand lenses I recommend starting with an inexpensive and common lens Helios-44-2 2/58 (aka HELIOS-44-2 2/58). The following links can look at modern lenses Zenitar и HELIOS.
Material prepared Arkady Shapoval.
Congratulations.
I have the following problem: I insert the lens onto the camera until it clicks, close the aperture completely, and the protrusion does not reach the EE lever. On the film camera it is clear that the important diaphragms do not stick together (they do not stand up and do not rise). So it seems that if the mount is turned, it is not in its place.
Have you ever cleaned up anything with this lens? How can you correct this?