> From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
>
> And no one caught my error in attempting to correct the first error. I
> said the square root of two was a multiplier for the area. It is but
> must be applied to the radius of the aperture to arrive at the area.
Well, only if you assume that the lens is not square. :-)
Actually, I use the notion of a square lens in my classes to explain the
geometric series of f-stops. It's much easier to show how a lens with twice the
width has four-times the light gathering power.
----------------
I wonder why. I wonder why. I wonder why I wonder. I wonder why I wonder why I
wonder why I wonder! -- Richard P. Feynman
:::: Jan Steinman, EcoReality Co-op ::::
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