--- Drikus van der Veen
<[EMAIL PROTECTED]> wrote:
>
>
> > An f-stop is simply the ratio between the focal
> length
> > of the lens and the diameter of the aperture.
> Nothing
> > more, nothing less.
>
> I think this line should be:
>
> An f-stop is simply the ratio between the principal
> focal length of the lens
> and the principle diameter of the aperture, Nothing
> more, nothing less.
That's quite true. I was simplifying for the sake of
the discussion, and this extra bit of accuracy doesn't
really change the point that was being discussed.
=====
Bob Meyer
I wish I knew what I know now, when I was younger...
http://www.meyerweb.net/epson
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