Industar 50-2 - lens review
The Industar 50-2 it's a very, very small lens made for SLRs and rangefinder cameras starting from 1959. Is has a screw mount, either M39 or, as mine, M42 and a stepless aperture, which is kind of interesting. Although the name is 50-2 it's not a 50 millimeters f/2, it's actually at its widest an f3.5, which means it's not the brightest lens. The construction is quite simple, I took it apart to clean it and, well, I had no problems doing so. I actually had to clean because it needed to be lubricated a little bit, but since I have put some oil in it, it works just fine. The metal body houses three optical elements, it weights only around 80 grams, it is 19mm long when focused to infinity and 25mm when extended with a 34mm front thread. Aperture, as said, is stepless, with seven blades and goes from f3.5 to f16. The focusing ring rotates more or less 310 degrees, which usually means that it is easy and precise to focus, but this lens is not sharp so it ...