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Manual Focus Override
In photography, manual focus override, also known as full-time manual focus, allows manual intervention in the autofocus acquisition process simply by turning the focus ring on a photographic lens. There are a number of technologies used to implement this feature. Pentax is a brand name used primarily by the Japanese multinational imaging and electronics company Ricoh for DSLR cameras, lenses, sport optics (including binoculars and rifle scopes), and CCTV optics. The Pentax brand is also used by Hoya Corporatio ... uses the trademark '' Quick Shift'' to refer to its implementations of manual focus override. {{photography-stub Photography equipment ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autofocus
An autofocus (or AF) optical system uses a sensor, a control system and a motor to focus on an automatically or manually selected point or area. An electronic rangefinder has a display instead of the motor; the adjustment of the optical system has to be done manually until indication. Autofocus methods are distinguished as active, passive or hybrid types. Autofocus systems rely on one or more sensors to determine correct focus. Some AF systems rely on a single sensor, while others use an array of sensors. Most modern SLR cameras use through-the-lens optical sensors, with a separate sensor array providing light metering, although the latter can be programmed to prioritize its metering to the same area as one or more of the AF sensors. Through-the-lens optical autofocusing is usually speedier and more precise than manual focus with an ordinary viewfinder, although more precise manual focus can be achieved with special accessories such as focusing magnifiers. Autofocus accuracy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Focus Ring
In the field of photography, a manual focus camera is one in which the user has to adjust the Focus (optics), focus of the photographic lens, lens by hand. Before the advent of autofocus, all cameras had manually adjusted focusing; thus, the term is a retronym. The focus itself may be adjusted in a variety of ways. Larger view cameras and the like slide the lens closer or further from the film plane on rails; on smaller cameras, a focus ring on the lens is often rotated to move the lens elements by means of a helical screw. Other systems include levers on the lens or on the camera body. There are a number of ways in which focus may be determined. Simplest is using a distance scale and measuring or estimating distance to the subject. Other methods include the rangefinder, which uses triangulation to determine the distance. On other cameras, the photographer examines the focus directly by means of a focusing screen. On the view camera, this ground glass is placed where the fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentax
is a brand name used primarily by the Japanese multinational imaging and electronics company Ricoh for DSLR cameras, lenses, sport optics (including binoculars and rifle scopes), and CCTV optics. The Pentax brand is also used by Hoya Corporation for medical products & services, TI Asahi for surveying instruments, and Seiko Optical Products for certain optical lenses. Corporate history Early history The company was founded as Asahi Kogaku Goshi Kaisha in November 1919 by Kumao Kajiwara, at a shop in the Toshima suburb of Tokyo, and began producing spectacle lenses (which it still manufactures). In 1938 it changed its name to , and by this time it was also manufacturing camera/cine lenses. In the lead-up to World War II, Asahi Optical devoted much of its time to fulfilling military contracts for optical instruments. At the end of the war, Asahi Optical was disbanded by the occupying powers, being allowed to re-form in 1948. The company resumed its pre-war activities, manufacturi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quick Shift
Quick, as an adjective, refers to something moving with high speed. Quick may also refer to: In business * Quick (restaurant), a Belgian fast-food restaurant chain * Quick (sportswear), a Dutch manufacturer of sportswear * Quick (automobile), an early American automobile * QIC (data backup) Quarter inch Cartridge, pronounced quick Music * The Quick (U.S. band), a rock band from Los Angeles * The Quick (UK band), a pop band from England * Quick (dance group), a hip hop dance group * ''Quick'' (album), a 1994 independently released album by Far Films * ''Quick'' (1932 film), German film starring Lilian Harvey * ''Quick'' (1993 film), American crime film starring Teri Polo * ''Quick'' (2011 film), South Korean film * ''Quick'' (2019 film),, also known as ''The Perfect Patient'', Swedish film Publications * ''Quick'' (German magazine), published 1948–1992 * ''Quick'' (newspaper), a defunct free weekly tabloid in the Dallas-Fort Worth area from 2003 to 2011 In sports ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
