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Canon FD
The Canon FD lens mount is a physical standard for connecting a photographic lens to a 35mm single-lens reflex camera body. The standard was developed by Canon of Japan and was introduced in March 1971 with the Canon F-1 camera. It served as the Canon SLR interchangeable lens mounting system until the 1987 introduction of the Canon EOS series cameras, which use the newer EF lens mount. The FD mount lingered through the release of the 1990 Canon T60, the last camera introduced in the FD system, and the end of the Canon New F-1 product cycle in 1992. Overview The FD mount is mechanically compatible with and replaced Canon's earlier FL mount,which in turn had replaced the R mount; FD-mount cameras can use FL lenses in stop-down metering mode and R lenses will mount, but must be used with manual aperture and stop-down metering. Though never officially explained by Canon, others have attempted to assign a meaning to the "FD" designation. One such attempt states that the "FD" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canon T90 Img 1331
Canon or Canons may refer to: Arts and entertainment * Canon (fiction), the material accepted as officially written by an author or an ascribed author * Literary canon, an accepted body of works considered as high culture ** Western canon, the body of high culture literature, music, philosophy, and works of art that is highly valued in the West * Canon of proportions, a formally codified set of criteria deemed mandatory for a particular artistic style of figurative art * Canon (music), a type of composition * Canon (hymnography), a type of hymn used in Eastern Orthodox Christianity. * ''Canon'' (album), a 2007 album by Ani DiFranco * ''Canon'' (film), a 1964 Canadian animated short * ''Canon'' (manga), by Nikki * Canonical plays of William Shakespeare * ''The Canon'' (Natalie Angier book), a 2007 science book by Natalie Angier * ''The Canon'' (podcast), concerning film Brands and enterprises * Canon Inc., a Japanese imaging and optical products corporation * Château ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fluorite
Fluorite (also called fluorspar) is the mineral form of calcium fluoride, CaF2. It belongs to the halide minerals. It crystallizes in isometric cubic habit, although octahedral and more complex isometric forms are not uncommon. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 4 as fluorite. Pure fluorite is colourless and transparent, both in visible and ultraviolet light, but impurities usually make it a colorful mineral and the stone has ornamental and lapidary uses. Industrially, fluorite is used as a flux for smelting, and in the production of certain glasses and enamels. The purest grades of fluorite are a source of fluoride for hydrofluoric acid manufacture, which is the intermediate source of most fluorine-containing fine chemicals. Optically clear transparent fluorite has anomalous partial dispersion, that is, its refractive index varies with the wavelength of light in a manner that differs from that of commonly used glasses, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aspheric Lens
An aspheric lens or asphere (often labeled ''ASPH'' on eye pieces) is a lens whose surface profiles are not portions of a sphere or cylinder. In photography, a lens assembly that includes an aspheric element is often called an aspherical lens. The asphere's more complex surface profile can reduce or eliminate spherical aberration and also reduce other optical aberrations such as astigmatism, compared to a simple lens. A single aspheric lens can often replace a much more complex multi-lens system. The resulting device is smaller and lighter, and sometimes cheaper than the multi-lens design. Aspheric elements are used in the design of multi-element wide-angle and fast normal lenses to reduce aberrations. They are also used in combination with reflective elements (catadioptric systems) such as the aspherical Schmidt corrector plate used in the Schmidt cameras and the Schmidt–Cassegrain telescopes. Small molded aspheres are often used for collimating diode lasers. Aspher ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diaphragm (optics)
In optics, a diaphragm is a thin opaque structure with an opening ( aperture) at its center. The role of the diaphragm is to ''stop'' the passage of light, except for the light passing through the ''aperture''. Thus it is also called a stop (an aperture stop, if it limits the brightness of light reaching the focal plane, or a field stop or flare stop for other uses of diaphragms in lenses). The diaphragm is placed in the light path of a lens or objective, and the size of the aperture regulates the amount of light that passes through the lens. The centre of the diaphragm's aperture coincides with the optical axis of the lens system. Most modern cameras use a type of adjustable diaphragm known as an iris diaphragm, and often referred to simply as an iris. See the articles on aperture and f-number for the photographic effect and system of quantification of varying the opening in the diaphragm. Iris diaphragms versus other types A natural optical system that has a diaphra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FD Autofocusing
FD or similar may refer to: Science and technology *Canon FD lens mount, a standard for connecting a lens to a camera *Familial dysautonomia, a disorder of the autonomic nervous system *Fermi–Dirac statistics (F–D statistics), in quantum statistics *Ferredoxin, iron–sulfur proteins *File descriptor, in Unix and related computer operating systems *Freedesktop.org (fd.o), an interoperability project *Functional dependency, a constraint in a relation from a database *Nissan FD engine, for trucks and buses Transportation *Thai AirAsia, IATA airline code FD *Mazda RX-7 (FD), a car *FD Phantom, original name for the FH Phantom jet fighter *Russian locomotive class FD *Flight director (aeronautics), a flight instrument *Flying Dutchman (dinghy) Other uses *Formula Drift, an American motorsport series *Fidei defensor (Latin, 'Defender of the Faith'), part of the full style of many English/British monarchs *Fixed deposit, a financial instrument *Finance Director, or chief fina ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canon AT-1
The Canon AT-1 is a 35mm FD-mount single-lens reflex camera manufactured by Canon of Japan from December 1977. It was produced purely for export and was never sold in the home Japanese market. It is a version of the popular AE-1 but without the shutter-speed priority auto-exposure mode of that camera. The AT-1 features manual exposure only. This made the camera cheaper, as some consumers did not desire or require autoexposure and did not want to pay for it. A light meter is included, featuring TTL center-weighted average metering with a CdS photocell, and a match needle in the viewfinder In photography, a viewfinder is a device on a camera that a photographer uses to determine exactly where the camera is pointed, and approximately how much of that view will be photographed. A viewfinder can be mechanical (indicating only direct .... The accessories produced for the AE-1 also work with the AT-1, including motor drives. Image:Canon-AT-1-B&W.jpg, Canon AT-1 with 50mm f/1.8 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canon AE-1
The Canon AE-1 is a 35 mm single-lens reflex camera, single-lens reflex (SLR) film camera for use with interchangeable lenses. It was manufactured by Canon Camera K. K. (today Canon Inc., Canon Incorporated) in Japan from April 1976 to 1984. It uses an electronically controlled, electromagnet horizontal cloth focal plane shutter, with a speed range of 2 to 1/1000 second plus Bulb (photography), Bulb and photographic flash, flash Flash synchronization, X-sync of 1/60 second. The camera body is 87 mm tall, 141 mm wide, and 48 mm deep; it weighs 590 g. Most are silver, with black grip and chrome trim, but some are black with silver and trim. Its name refers to the fact that it's an electronic camera using the aperture for automatic exposure (shutter speed priority). It's sometimes stated that the AE-1 was the first microprocessor-equipped SLR, but this is incorrect. Canon's competitor Nikon introduced 1972 the Nikkormat EL, the world's first camera with an I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canon EF Camera
The Canon EF is a manual focus 135 film, 35mm single-lens reflex camera produced by Canon Inc., Canon between 1973 and 1978. It was compatible with Canon's Canon FD, FD-mount lenses. The EF was built as an electro-mechanical version of Canon's top-of-the line wholly mechanical Canon F-1. The shutter is mechanical at all speeds ½ second and faster, but at 1 second and longer the shutter is all electronically controlled, allowing AE exposures from 1/1000 to 30 seconds. The EF shares the F-1's rugged construction and tough metal body. Unlike the F-1, the EF does not support any motor drive for film transport. Neither does it provide any interchangeable viewfinder. Features The Canon EF contained a silicon photocell light meter with a range of Exposure value, EV 18 to EV -2 which measured light in a "central emphasis metering" pattern (also called metering mode#Center-weighted average metering, center weighted average metering) with less influence from the top of the frame, to min ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canon Inc
Canon Inc. (; Hepburn: ) is a Japanese multinational corporation headquartered in Ōta, Tokyo, specializing in optical, imaging, and industrial products, such as lenses, cameras, medical equipment, scanners, printers, and semiconductor manufacturing equipment. Canon has a primary listing on the Tokyo Stock Exchange and is a constituent of the TOPIX Core 30 and Nikkei 225 indexes. It used to have a secondary listing on the New York Stock Exchange. Name The company was originally named (). In 1934, it produced the ''Kwanon'', a prototype for Japan's first-ever 35mm camera with a focal-plane-based shutter. In 1947, the company name was changed to ''Canon Camera Co., Inc.'', shortened to ''Canon Inc.'' in 1969. The name Canon comes from Buddhist bodhisattva (), previously transliterated as Kuanyin, Kwannon, or Kwanon in English. History 1933–1970 The origins of Canon date back to the founding of Precision Optical Instruments Laboratory in Japan in 1933 by Takeshi Mitarai, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
