--- Henry Posner/B&H Photo-Video
<[EMAIL PROTECTED]> wrote:
> At 03:28 PM 07/30/2001, you wrote:
> > >Now this does raise an interesting question. Dos
> the
> > >aperture actually change size as you zoom, or
> only
> > >when the lens is stopped down for picture taking?
>
> With the EOS system, no matter what sort of lens,
> the aperture blades are
> wide open until you're actually shooting (unless you
> activate D-o-F Preview).
But if that's accurate, it implies that the 70-200 2.8
is actually much faster than 2.8, at the 70mm end,
when you are viewing (before taking the picture). And
I don't think that's really the case. I think the
actual diameter of the aperture must vary as you zoom
to maintain a constant 2.8 aperture.
=====
Bob Meyer
I wish I knew what I know now, when I was younger...
http://www.meyerweb.net/epson
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