Quote Originally Posted by PDH View Post
If you are unable to clean the lens and decide to replace the lens, and you intend to use the rangefinder you need to buy another 135mm or the rangefinder cam will not match the focal length of the lens and you will out of focus.
Unless he gets another Optar/Raptar (or lens with identical flange focus distance) he'll nedd to recalibrate the RF anyway.
Checking the RF calibration should be mandatory on a used camera, as well as checking the GG registry.