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 Circle of Confusion - CoC - Info 
richardrosenman
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Joined: 23 Oct 2005
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In optics, the circle of confusion is a term relating to the fuzziest a point can be and still be called "in focus" (this is related to the depth of field). In photography, this value is often calculated as the largest circle on the film that will still be seen as a point when enlarged to 8"x10" and viewed from a normal viewing distance (2-3 feet).

Source & more info: http://en.wikipedia.org/wiki/Circle_of_confusion

-Richard

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