On Sat, 15 Mar 2003 22:23:05 -0800, you wrote:

>If you look into the front of the 28-135 while zooming it, there's a
>circular, telescoping/dilating aperture-like mechanism visible.
>What's this called and what does it do?  


Wait, never mind.  Boy do I feel dumb.  I just realized I'm seeing the
second element back moving back and forth and changing the amount it's
magnified by the front element.  :-\


Ken

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