31 Jan
2003
31 Jan
'03
12:09 a.m.
Chuck, Thank you! Excellent explanation, and yes, I finally get it -- perfect analogy with the camera's depth of field increase as the iris shrinks -- that IS something I'm familiar with. -Rich --- Chuck Hards <chuckhards@yahoo.com> wrote:
So, to get a larger distortion-free zone, we have to change that F-RATIO. To keep the focal length the same, you have to reduce diameter to increase the RATIO (like a camera lens iris).
Get it?
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