Speaking about Helios-44m-6 lens, we can say that according to some viewpoints this model is one of the best representatives of Helios-44m-X. As for its technical features, they are almost similar to the later versions of Helios-44.
Key performance characteristics can be brought in figures regarding the number of lenses – 6/4, the number of aperture leaves is 6, the maximum aperture ratio is F2.0. Focus distance is similar to other models of Helios and is equal to 58 mm, there is also an option of bouncing aperture and multilayer coating.
The place of manufacturing of the lens is the optical-mechanical plant «Jupiter» in the town of Valdai in Russia. The precursor model Helios 44 was produced at the mechanical plant named after Zverev in the town of Krasnogorsk. This fact confirms the assumption that the following Helios 44 models were widely produced in other plants. However, it didn’t affect the qualitative features of lenses.
The preconditions for the name Helios 44 is its resolution. The exterior of this lens is completely similar to the other models of Helios-44m-X series. Besides, it has an automatic aperture. As for the exterior, you can note that this model is dominated by the classic black design. Digital aperture and focus indicators are painted with yellow, green and red colors. These similarities can be noted in old Nikon lenses.
Speaking about the distinctive properties of Helios-44m-6 or Helios-44 (also including such models as m-7, m-5, m-4), we can say about M39 bayonet mount in the latter model, and M42 – in the former one. Helios 44 optical filter thread reaches 49 mm, it does not let us take the opportunity of the standard filter which requires 52mm. Meanwhile, Helios 44m-6 has a standard thread size of 52 mm. Moreover, a newer model of Helios 44m-6 has an option of multilayer coating, compared to Helios 44 and Helios-44m-4 having only single coating, although there are 44m-4 models with multilayer coating.
You can notice excellent bokeh performance. Focusing is smooth, which is very convenient. If you have a long experience in using this lens, you can reveal all its hidden potential.