I have a FED-2, wit ha FED 50/3.5 collapsible lens. Built like a tank (T-52?), has a very long-baseline rangefinder which at least in this case is very, very precise. An added bonus for me is htat the dioptre correction on the viewfinder goes all the way to -4. So I'm actually able to see through the viewfinder - which is about a first.
Didi I mention that I also have a large number of FED, Industar-22 and Industar-50 lenses, all collapsible and 50mm/f:3.5? I promise to test the accuracy of the focusing of any lens before I foist it off on someone else