OK well my buddy got this lens today for his new D80...now I thought they are supposed to have a silent focus system. This lens seems to make some noise..not loud but my 150 sigma Macro makes zero noise. all you hear is a little woosh his as a def louder sound. Is this typical of this lens or something wrong with his.
Edit: I know when i was playing with that 120-300 the other day its focus was Silent as well..could it be cause its a nikon version of the lens..I dont think that would make a difference

