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Autofocus cameras



We were discussing the physics of our autofocus TV camera yesterday, and
came to the conclusion that we don't know how it works. I am talking
about the systems used in the more expensive SLR cameras, for example,
which do NOT employ a pulsed infrared beam. Does anybody understand the
principle behind these non-infrared autofocus sensors?

-----Rich Sankovich, Univ of Missouri Physics Dept, sanko@physics.umr.edu