The tension ring will rotate with the focus ring, but will not loosen.
It will loosen when you turn it without turning the focus ring.
Pierre
At 09:21 7/16/2001 -0700, you wrote:
>Hi-
>
>I was at my local camera shop yesterday and I tried out the 100-400mm
>f/4.5-5.6L IS USM, and I've got a question. (that the salesman didn't seem
>to know)
>
>Is there some sort of locking device that will prevent the manual focusing
>ring from also moving the zoom tension ring? Or is it a design flaw? This
>was really annoying. I would tweak the manual focusing ring, and the zoom
>tension ring would move back and fourth right along with it. We even
>tightened down the tension ring as tight as it would go, and sure enough,
>you move the MF ring and the tension ring would loosen up and move with it.
>What am I missing here?
>
>Thanks,
>Trenton
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