Why won't canon lens fully work in autofocus.?

Canon lens 28-105mm attached to 5dmarkiii body will not always work in auto focus mode. I think I can occasionally get it to work in alfocus but even in manual the lens occasionally won't register focused objects. Do I have a problem with the lens or do I need to change a setting somewhere to get the camera to know what lens is on it?

JonKline wrote:
Assuming you have the switch on the lens set to AF, and the camera set to use AF, that's all you should need to do.
I would suggest you send your lens in for servicing.
Ah, this thread brings back memories. The 28-105 was my first lens on my first DSLR. I still have it, though it now resides on the sparest of my spare cameras (the one that goes to the first grandchild that shows any interest in a camera that's not part of a cell phone). It's not nearly as bad as Ernie Biggs makes it out to be, and I got some good pictures with it. But if it broke, I wouldn't pay actual money to have it serviced.
And I wouldn't dream of insulting my 5D3 by using that lens on it.
Bob
Boston, Massachusetts USA

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