Hi Guys,
Just got back from hols where I was clicking away with my trusty Canon 5D Mk2 and 24-105L when it struggled to lock on to a subject then when I pressed to take the shot up came the error 01. On the screen it said communications between camera and lens is faulty - clean the lens contacts. Now, this lens hardly ever comes off hte camera but I did remove and cleaned the prestine looking contact points. I do not recall knocking or catching the lens anywhere but managed to keep it working at 24mm with no problems until I zoomed in a bit.
I have just tried a 16-35 lens and the was no