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 optics imaging technology raises the depth-of-field of up to five times, thereby significantly improving the user experience.
Similar, extended depth-of-field improvements will also benefit machine-vision systems, such as those for reading barcodes, sorting packages, and assembling and inspecting electronic circuits, Dowski predicts.
a leading developer of innovative, timesaving solutions for professional and advanced amateur photographers, today announced FocalPoint 2, an Adobe Photoshop plug-in for simulating depth-of-field and selective focus.
The new CINE-SERVO lens features high 4K optical performance throughout the broad focal length of 17mm to 120mm within its compact and lightweight body, a three-group inner focus system to help minimize focus breathing and provide a stable angle of view, an 11-blade iris to help achieve creative depth-of-field manipulation and natural "bokeh" background, user-friendly design features, support for matte boxes, follow focus and other accessories, and rugged reliability.
8D lenses, expanding a series of lenses that allow photographers to effectively correct perspective and/or depth-of-field to push creative boundaries.
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.
New Guide is an Elegant Tool for Depth-of-Field Calculations, Optimized for Multiple Digital Sensor and Film Formats
The rounded seven-blade diaphragm ensures smooth bokeh even when shooting portraits or product shots at a medium aperture to maintain reasonable depth-of-field.
ST plans to support the various Software Lens(TM) optics including: wide apertures (low F#) for increased indoor use and low light camera performance, for both fixed and Auto-Focus cameras; Extended Depth-of-Field (EDoF) that enhances the camera's in-focus range from business card and bar-code scanning to best infinity; and low profile lens with up to 30% reduction in optical lens/zoom height.
the pioneer in diffusion filters that allow photographers to balance color at capture, today announced the ExpoAperture Depth-of-Field Guide, a small circular pocket guide that enables photographers to quickly determine the maximum and minimum depth of field for a given focal length and aperture size.
Capable of 132nm wavelengths, the 193nm immersion system also provides a greater than 200 percent depth-of-field improvement versus dry lithography systems.
Digital Effects of the GR-SZ1 include, Portrait mode which automatically reduces depth-of-field for a blurred background portrait effect and Sports ode for clearer recording of fast action shots.