Great lens on this camera. Rangefinder calibration is done via 2 screws (horizontal and vertical) - see here for a description. I love mine - my only complaint is the film advance throw is quite powerful - not an issue for most commercial packaged rolls, but if you're bulk-rolling your own, make sure the film is taped securely to the spindle or it will come off completely. Not a big deal, but a bit of a surprise when it happened to me the first time