Oh, just another apples and oranges case - I-11M is a true apochromate, as I can see, perfectly corrected from 1:1 ratio to infinity, and covering probably 30*40cm format. And I-37 is a simple yet very well-made Tessar with uniquely large aperture... so good for portraits and so cheap nowadays (though there are some bad specimens, of course, but in whole it's quite good). I-11M is much sharper and contrastier, as any process lens - but that can be used nicely, I expect it to be an excellent performer for scenes where the whole material facture should be preserved. And it should work very well with color film, I suppose.

Quote Originally Posted by celluloidpropaganda
I wonder how this compares to the Industar-37 (300/4.5)?