depth of field

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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)
References in periodicals archive ?
The iris mechanically adjusts the f-stop setting of the lens.
For example, choosing the Landscape setting reveals a sample of a landscape photo, and describes the appropriate f-stop, shutter speed and other settings needed to take that picture.
There is also an aperture priority AE mode for choosing the f-stop, as well as a shutter priority AE mode for selecting the right shutter speed to capture images of fast-moving subjects.
For example, professional photographers can directly access advanced camera functions like f-stop and shutter speed giving them more control over their images Mobile professionals can now integrate visual information with their daily workflow.
For example, photographers can not only directly access advanced camera functions like f-stop and shutter speed, but also automatically apply filters and take multiple images to average lighting, giving them more control over their images.
Designed for control from a handheld remote or computer screen, the units offer infinite flash power settings from 32 watt seconds to 1,000 watt seconds - a full 6 f-stop range of light.
F-Stop For VIP bottle service among the cities pro athletes and celebrities, F-Stop is a good place to start.
Their fast f-stop broadens users' scope of photographic expression, such as low-light photography and scenes with beautiful bokeh effects.
LENS FLAIR Steve Mayes with his exhibition of at the F-Stop Gallery in Byker A NIGHT ON TYNESIDE Steve Mayes' photograph took first place in the British Institute of Professional Photography's regional competition
Older SLR cameras have two main dials to set: the shutter speed (which controls the speed of the shutter), and the f-stop (which controls the size of the aperture through which light entered the camera).
The actual range it can cope with depends on the exposure and f-stop setting of the camera.
of the liver uk/pictures/ But things like the right f-stop and depth of field are still in the photographer's hands as he tries to concentrate on the flower head and pull it out from its background.