The depth of field is the region where the size of the circle of confusion is less than the resolution of the human eye. Circles with a diameter less than the circle of confusion will appear to be in focus.Lens and ray diagram for calculating the circle of confusion diameter c for an out-of-focus subject at distance S2 when the camera is focused at S1.  The auxiliary blur circle C in the object plane (dashed line) makes the calculation easier.An early calculation of COC diameter ("indistinctness") by "T.H." in 1866.
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