The focus ring started to slip, and not move the barrel. In attempting to understand what was wrong with it I managed to unscrew the whole lens barrel from the focus ring (oops) mechanically sound. I just need to understand how to fit it all back together again. I now understand that all I need to have done was tighten the little screws under th erubber ring of the focus ring. Too late. The lens has a reverse s***w, but I need to line up the aperture mechanism etc which is impossible if I'm s******g down onto it. A site with pictures would be ideal!Cheers, from a very upset wide angle fan.
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