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Can you tell me how does the Biotar 58 f/2 (m42) stack up against my Planar (zebra) 50 1.8 (m42) in terms of IQ (sharpness, bokeh,color rendition, etc etc)?
Sorry, I've only used the white MC version of the Pancolar, but what I've seen from the Biotar is that it has much stronger swirly bokeh than the Pancolar. The Pancolar already has some of this effect, but it's much more exaggerated with the Biotar. You can use it creatively but it gives some people a feeling of motion sickness (as if the image is spinning). Look for posts from Jim Schemel -- he has been posting some images taken with that lens recently.