At 19:43 11/20/99 , you wrote:
><snip>
>So for any given aperture, longer lenses will have a physically larger
>diameter aperture relative to shorter focal length lenses, and is this why
The best explanation I've seen on the web that avoids
"math-degree-required-to-understand" Bessel Function details can be found
under the "Diffraction" section here (about 50 0own the very long page):
http://www.photo.net/photo/optics/lensTutorial.html
His simplified math works for relatively simple lens designs. Complex
designs used in super-wides, compact long focal length teles, and zooms are
a different story.
-- John
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