Bought a Bronica ETRS second hand a while ago but hadn't gotten round to using it properly. I have a waist level finder and an AE-II finder, everything works with the waist level, but the AE-II seems to be focussing incorrectly - when the lens is set to infinity, it focuses at about 15feet tops - is there anything I can do about this? I'm guessing that when set to infinity, the lens is focussing there - because it works okay with the waist level finderl.