Some years back, I had an R2A/J8 combo that the focus was not correct. Brian Sweeney shimmed it to LTM specs. After that it focused properly at all distances. I have a 1958 J8 that I mounted on a Canon P. According to the lens distance scale, focus to a known distance shows way too short. I just got this body, so maybe that is the problem. That is the reason for wanting another (non FSU) lens. Thanks for your input.