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depth of field

The distance, on either side of the object plane focused on, through which satisfactory image definition can be obtained. For the special case of an imaging system with lens axis perpindicular to the image plane, focused at a range of 25 ft, and with definition acceptable for objects from 20 to 40 ft; the depth of field extends from 5 feet in front of, to 15 feet behind, the object plane focused on.
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