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In the sound booth or a quiet room, I can hear the elements of any AF lens move. And I own about 20 lenses and I can hear them all. After all, the friction of the elements moving on a plastic or metal drive train create vibrations which, in turn, is amplified in the barrel and mirror chamber. Plus the dad burn freakin' camera is pressed against your head. It's normal and would only be absent in a vacuum. However, most of us don't hear the elements move when shooting as ambient sounds normally cover it. If you can hear it while shooting on a city street or on a Pacific beach, you may have a problem.