>>
>This is an arbitrary relative scale, and what is rounded depends on the
>starting number. I would assume f/1 is the original base number. If you
>start a higher numerical value and work backwards, different numbers will be
>rounded. In fact, most numbers are rounded including f/1.4 if you start at
>1. It is based on the fact that the amount of light passed by a lens is
>inversely proportional to the square of the f-number.
>
>Doug
>
I guess there is additional "rounding" in the assumption that the aperture
is circular instead of a multi-sided polygon, as well.
Winsor
Winsor Crosby
Long Beach, California
mailto:wincros@xxxxxxxxxxx
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