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UPDATE
The forum will be moving to a new domain in the near future (canonrumorsforum.com). I have turned off "read-only", but I will only leave the two forum nodes you see active for the time being. I don't know at this time how quickly the change will happen, but that will move at a good pace I am sure. ------------------------------------------------------------
Canon Rumors - Your best source for Canon news, rumors and creators
I was using my 5d3 and during use my 70-200 f4L IS started displaying and error (01 lens is unable to make contact the camera). I had shot about 100 shots with the lens before the error and there was no damage to the lens and it has worked fine up til now). It says to clean the lens contacts (gold prongs look fine). I tried other lenses and they seem to work. The f4 is about yr old and its stored in its box when not in use. Any thoughts?