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My absolute favorite lens developed some symptoms that seem problematic. It's going to head to CPS, but I thought I'd post and see if the experts could tell me what to expect.
Basically, it's an Err01 issue. On my 5d2, the lens buzzes and whirrs briefly (aperture movement sounds) from the moment it is attached to the camera, even if the camera is off. I can take photos with the lens without error messages as long as it is not wide open at 1.4, or stopped down past 3.2, but the lens will make the buzz/whirr aperture sound immediately after taking a photo. Wide open at 1.4 or stopped down 3.2 or beyond leads to an Err01 message when a photo is taken. The sound comes from the aperture closing partially at least twice in short succession.
On a 5d3, the Err01 is immediate from the moment the lens is mounted and the camera is turned on.
I tried cleaning the contacts of the lens really well with a pencil eraser. Doesn't seem to have any effect...
What do you guys think this might be?