Thanks useful information: 
I am in Poland and have a problem with the 5dmkiii when coupled with my 24-105. I receive an error response of " Communications between the camera and lens is faulty. Clean the lens contacts.
I tried the 70-200 2.8is and it worked fine.
I have got some lens cleaning fluid and cleaned the contacts and mating surfaces and the 24-105 appears to now be fine.
As I am off to Auschwitz early next week, should this be an issue to worry about?
The lens was purchased used and has serial nbr UT1101 and 321958.
Is it likely the lens contacts may be worn. I ask this, because I can buy another lens here before travelling further and get this repaired at home.
Any thoughts?
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