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depth of field

noun Optics, Photography.
  1. the range of distances along the axis of an optical instrument, usually a camera lens, through which an object will produce a relatively distinct image.
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Origin of depth of field

First recorded in 1910–15
Also called depth of focus.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for depth of focus

depth of focus

noun
  1. the amount by which the distance between the camera lens and the film can be altered without the resulting image appearing blurredCompare depth of field
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depth of field

noun
  1. the range of distance in front of and behind an object focused by an optical instrument, such as a camera or microscope, within which other objects will also appear clear and sharply defined in the resulting imageCompare depth of focus
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

depth of focus in Medicine

depth of focus

n.
  1. focal depth
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.