Quote Originally Posted by rjr
And it should not fit a FED2... the tab hits the camera front. Unless it is an I-10?

Roman
That seems to be the main difference between FED lenses and Industar-22's. On some (but not all) of the Industar lenses the focusing tab hits the camera front just before infinity focus. I'm tempted to grind them down a bit...

So it seems the FED lenses are slightly different mechanically from the Industar ones.