Hi rangefinder comunity ;-) I have a problem with Jupiter 8 lens on Zorki 4. Lens was bad serviced before I bought that, I think, and distance and F-stop rings are unsynchronized with "depth of field scale" (the ring between distance and F rings). So, when I set to f/2, the scale shows ~f/2.8, and if I set to f/22 the scale shows more than 22. Also, when I focusing 1m distant object the distance scale shows a few meters, and vice versa. There is need of extra force to focusing, so I think that I should lubricate somehow... I desperately need help because this is my first Zorky and my entrance to rangefinder world.