this is the MC Volna-3 lens (on the left), compared to my Pentax SMC A 645 75mm f2.8:
bare-metal aperture blades, good for "interesting" flare:
in typical build quality - everything feels just a degree or two off, every moving component (aperture & focus rings) wiggles just a bit more that you would expect...
this may be due to the wear and tear on my copy, but previous Soviet-era purchases lead me to believe that this is just the way it was...
I will be using this lens adapted to my 645D via simple adapter...