> So, the ratio between the diameters of consecutive stops is the square
root
> of two. Because in the F/stop formula, the diameter of the opening is in
> the denominator, the actual f number increases by a factor of two, as the
> diameter decreases by a factor of two.
oops. factor of the square root of two.
John
Received on Tue Oct 30 16:52:03 2001
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