----- Original Message -----
From: "Kevin Horton"
> A "standard"  lens  is one that gives a  perspective which is close to
> what human eye see. This occurs  when the length of the frame diagonal
> is approximately the same as the focal length.
>
To back up what Kevin wrote, I found a reference at
http://hypertextbook.com/facts/2002/MiriamJanove.shtml

Brian Price

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