I just purchased a used Bronica RF645 with both the 45 and 65 lenses and love it! I have recently come across a good deal on the 135mm lens. I know that Bronica had problems with the 135 lens due to focussing, so they discontinued it and instread introduced a 100mm lens. I'm not interested in a 100mm lens. But, is there any way I can purcahase the 135 lens and send my camera somewhere to have it calibrated with the new lens for perfect focussing. I've heard in other forums that this is possible. Has anyone else done this with the 135 lens and where can this be done? Thanks alot!