Hi all, I'm struggling with a 180mm RZ lens. It looks like it is ignoring whatever speed setting is on the camera body and just firing at what I assume is 1/400th. I have tried it in on two bodies with the same results, and I have tried a different lens on the bodies which works. I guess it is an electrical problem which means the lens is reverting to its mechanical default. I've tried cleaning the contacts but nothing changes. Interestingly I was buying a second hand lens in a shop near my office a few weeks ago and the first 2 lenses they pulled off their shelves exhibited the same behaviour. Does anyone have any advice?