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It's not a problem, but it is curious. I have noticed that on my 70-200 2.8L version II the IS is much louder on my 1ds II than it is on my 1d IV, using the same camera settings ( both cameras set to manual with identical settings) . It's not noticeable on the orginal 70-200 2.8L .
I thought the lens was having problems until I moved it from the 1ds II to the 1d IV, strange that it's so much quieter.