The Zenitar M2s is a very surprising lens. Designed to be a cheap replacement for Helios 44-x lenses as a kit lens for Zenit DSLRs, is a 50/2 lens in a fully plastic barrel (although some internals are made of metal). This plastic housing is really a pity, as it gives it a cheap look and feeling.



However, from an optical point of view, it is really surprising. A smooth bokeh wide open, quite robust against flare and very sharp once stopped down (even if wide open sharpness is already quite good). Krasnogorsky Zavod (the manufacturer) rates it as able to resolve 65/40 l/mm, while the supposedly very sharp MC Helios 44M-7 is only rated as able to resolve 50/30 l/mm.

It is available under the "Zenitar M2" and "Zenitar M2s" labels for the m42 version, and "Zenitar K2" for the K mount version:
KMZ page about this lens

Here are a few shots with it, from my 2009 Pic-A-Day gallery:

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