

Helios 44M-6 is part of the series of lenses having the M42 mount; this is where the M in the name comes from. This mount was introduced by Carl Zeiss Biotar for the lenses being used on the Praktica photo cameras.
The lens presents an effect called swirly bokeh, which is more pronounced on the older lens models in the series, such as Helios 44M-2. This type of bokeh can be seen on all of the models of Helios-44 and Helios-40 and is characterized as an optical vignetting. The bokeh “circles” get more ellipsoidal as the person using the lens moves further away from the subject in question.
This is a prime lens, not a zoom lens. It has a focal distance of 58mm, which makes it the perfect choice for portrait photography, or macro.
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