Thursday, June 12, 2008

Near : Far Distribution

The DOF beyond the subject is always greater than the DOF in front of the subject.

When the subject is at the hyperfocal distance or beyond, the far DOF is infinite; as the subject distance decreases, near:far DOF ratio increases, approaching unity at high magnification.

The oft-cited “rule” that 1/3 of the DOF is in front of the subject and 2/3 is beyond is true only when the subject distance is 1/3 the hyperfocal distance.

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