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depth of field
(redirected from Depth-of-field)

   Also found in: Encyclopedia, Wikipedia 0.02 sec.
depth of field
For a given setting of an optical system (or a steady state of accommodation of the eye) it is the distance over which an object may be moved without causing a sharpness reduction beyond a certain tolerable amount. Depth of field increases when the diaphragm (or pupil) diameter diminishes as, for example, in old eyes (Fig. D1). Examples: viewing at infinity, the depth of field ranges between infinity and about 3.6 m for a pupil of 4 mm in diameter; and between infinity and about 2.3 m for a 2 mm pupil. At a viewing distance of 1 m, the depth of field ranges from about 1.4 m to 80 cm with a 4 mm pupil; and from about 1.8 m to 70 cm with a 2 mm pupil. See hyperfocal distance.
Fig. D1 Schematic representation of the depth of field and the depth of focus of an eye fixating an object at O (I, retinal image size corresponding to the tolerable resolution)enlarge picture
Fig. D1 Schematic representation of the depth of field and the depth of focus of an eye fixating an object at O (I, retinal image size corresponding to the tolerable resolution)


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Olympus Optical of Tokyo, also is licensing the Boulder company's technology for use in extended depth-of-field endoscopes, which are camera-equipped catheters that doctors use to look inside a patient's body.
The laser line projects a 1 mm or less wide line, regardless of the projector's distance to the target, with its 3' to 12' depth-of-field range.
Their sharp-focus, depth-of-field analyses of modular construction methods evolve into an abstract pattern of grids.
 
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