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Pentax 6×7
The Pentax 6×7 (called "Pentax 67" after 1990) is a SLR medium format system film camera for 120 and 220 film, which produces images on the film that are nominally 6 cm by 7 cm in size (actual image on the film is 56 mm × 70 mm), made by Pentax. It originally debuted in 1965 as a prototype dubbed the Pentax 220. Since then, with improvements, it was released in 1969 as the Asahi Pentax 6×7, as well as the Honeywell Pentax 6×7 for the North American import market. In 1990, it received a number of minor engineering updates and cosmetic changes and was renamed as the Pentax 67. The camera resembles a conventional 35 mm SLR camera, with interchangeable viewfinder and lens, but is considerably bigger and heavier, weighing with the plain prism and standard (105 mm ) lens. It is perhaps inspired by the 1957 East German 6×6 KW Praktisix and its successor, the Pentacon Six, although the horizontal SLR concept can b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentax 6x7 Austin Calhoon Photograph Front
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] |
Exakta
The Exakta (sometimes Exacta) was a camera produced by the ''Ihagee Kamerawerk'' in Dresden, Germany, founded as the Industrie und Handels-Gesellschaft mbH, in 1912. The inspiration and design of both the VP Exakta and the Kine Exakta are the work of the Ihagee engineer Karl Nüchterlein (see Richard Hummel's Spiegelreflexkameras aus Dresden), who did not survive the Second World War. An Exakta VX was used by James Stewart's character, a professional photographer, to spy on his possibly murderous neighbor in Alfred Hitchcock's ''Rear Window''. Characteristics Highlights of Exakta cameras include: * First single-lens reflex camera (SLR) for 127 roll film (VP Exakta) came in 1933 * First wind-on lever in 1934 * First built-in flash socket, activated by the shutter, in 1935 * First SLR for 35mm film came in 1936, the Kine Exakta Early Kine Exaktas had a fixed waist-level viewfinder, but later models, starting with the Exakta Varex, had an interchangeable waist- or eye-level fin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentax SLR Cameras
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] |
Macro Photography
Macro photography (or photomacrography or macrography, and sometimes macrophotography) is extreme close-up photography, usually of very small subjects and living organisms like insects, in which the size of the subject in the photograph is greater than life size (though ''macrophotography'' also refers to the art of making very large photographs). By the original definition, a macro photograph is one in which the size of the subject on the negative or image sensor is life size or greater. In some senses, however, it refers to a finished photograph of a subject that is greater than life size. The ratio of the subject size on the film plane (or sensor plane) to the actual subject size is known as the reproduction ratio. Likewise, a macro lens is classically a lens capable of reproduction ratios of at least 1:1, although it often refers to any lens with a large reproduction ratio, despite rarely exceeding 1:1. Apart from technical photography and film-based processes, where the s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gallium Photo Diode
Gallium is a chemical element with the symbol Ga and atomic number 31. Discovered by French chemist Paul-Émile Lecoq de Boisbaudran in 1875, Gallium is in group 13 of the periodic table and is similar to the other metals of the group (aluminium, indium, and thallium). Elemental gallium is a soft, silvery metal in standard temperature and pressure. In its liquid state, it becomes silvery white. If too much force is applied, the gallium may fracture conchoidally. Since its discovery in 1875, gallium has widely been used to make alloys with low melting points. It is also used in semiconductors, as a dopant in semiconductor substrates. The melting point of gallium is used as a temperature reference point. Gallium alloys are used in thermometers as a non-toxic and environmentally friendly alternative to mercury, and can withstand higher temperatures than mercury. An even lower melting point of , well below the freezing point of water, is claimed for the alloy galinstan (62–95% ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cadmium Sulfide
Cadmium sulfide is the inorganic compound with the formula CdS. Cadmium sulfide is a yellow solid.Egon Wiberg, Arnold Frederick Holleman (2001''Inorganic Chemistry'' Elsevier It occurs in nature with two different crystal structures as the rare minerals greenockite and hawleyite, but is more prevalent as an impurity substituent in the similarly structured zinc ores sphalerite and wurtzite, which are the major economic sources of cadmium. As a compound that is easy to isolate and purify, it is the principal source of cadmium for all commercial applications. Its vivid yellow color led to its adoption as a pigment for the yellow paint "cadmium yellow" in the 18th century. Production Cadmium sulfide can be prepared by the precipitation from soluble cadmium(II) salts with sulfide ion. This reaction has been used for gravimetric analysis and qualitative inorganic analysis.The preparative route and the subsequent treatment of the product, affects the polymorphic form that is produced ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catadioptric System
A catadioptric optical system is one where refraction and reflection are combined in an optical system, usually via lenses (dioptrics) and curved mirrors (catoptrics). Catadioptric combinations are used in focusing systems such as searchlights, headlamps, early lighthouse focusing systems, optical telescopes, microscopes, and telephoto lenses. Other optical systems that use lenses and mirrors are also referred to as "catadioptric", such as surveillance catadioptric sensors. Early catadioptric systems Catadioptric combinations have been used for many early optical systems. In the 1820s, Augustin-Jean Fresnel developed several catadioptric lighthouse reflectors. Léon Foucault developed a catadioptric microscope in 1859 to counteract aberrations of using a lens to image objects at high power. In 1876 a French engineer, A. Mangin, invented what has come to be called the Mangin mirror, a concave glass reflector with the silver surface on the rear side of the glass. The two surfaces o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
35 Mm Format
135 film, more popularly referred to as 35 mm film or 35 mm, is a format of photographic film used for still photography. It is a film with a film gauge of loaded into a standardized type of magazine – also referred to as a cassette or cartridge – for use in 135 film cameras. The engineering standard for this film is controlled by ISO 1007 titled '135-size film and magazine'. The term 135 was introduced by Kodak in 1934 as a designation for 35 mm film specifically for still photography, perforated with Kodak Standard perforations. It quickly grew in popularity, surpassing 120 film by the late 1960s to become the most popular photographic film size. Despite competition from formats such as 828, 126, 110, and APS, it remains the most popular film size today. The size of the 135 film frame with its aspect ratio of 1:1.50 has been adopted by many high-end digital single-lens reflex and digital mirrorless cameras, commonly referred to as " full frame". Even ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thames & Hudson
Thames & Hudson (sometimes T&H for brevity) is a publisher of illustrated books in all visually creative categories: art, architecture, design, photography, fashion, film, and the performing arts. It also publishes books on archaeology, history, and popular culture. Headquartered in London, it has a sister company in New York City, and subsidiaries in Melbourne, Singapore, and Hong Kong. In Paris it has a sister company, Éditions Thames & Hudson, and a subsidiary called Interart which distributes English-language books. The Thames & Hudson group currently employs approximately 150 staff in London and approximately 65 more around the world. The publishing company was founded in 1949 by Walter and Eva Neurath, who aimed to make the world of art and the research of top scholars available to a wider public. The company's name reflects its international presence, particularly in London and New York. It remains an independent, family-owned company, and is one of the largest publish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Takumar
Takumar is the name that Asahi Optical gave to its lenses, notably but not exclusively those for its own SLR cameras. Named after the Japanese-American portrait painter, , whose brother Kumao Kajiwara founded Asahi Optical. The name adorned its lenses until 1975, when Asahi switched from the M42 screw mount to the bayonet K-mount. K-mount lenses were simply named "SMC Pentax". Some Takumar lenses were also made for the K-mount. Details The Takumar designation was used on lenses designed for Asahi's 35 mm cameras, 6×7 cameras, and for other purposes too. * ''Takumar'' lenses were made in M37 screwmount for the original Asahiflex cameras and continued into the M42 period. * ''Auto-Takumar'' lenses were a type of preset lens. The user selected an aperture then engaged a lever to energise the stopping-down mechanism. The camera would then trip this mechanism when the shutter was fired. * ''Super-Takumar'' lenses featured an improved form of lens coating (to reduce fl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentacon Six
The Pentacon Six is a Single-lens reflex camera, single-lens reflex (SLR) Medium format (film), medium format camera system made by East Germany, East German manufacturer Pentacon from 1966 to 1992. The Six accepts lenses with the Pentacon Six mount, a breech-lock bayonet mount. History Praktisix The Praktisix was manufactured by Kamera Werkstätten (KW). It is a 6×6 SLR modelled on contemporary 35 mm SLRs. It was followed by the Praktisix II and Praktisix IIA, all with minor, relatively cosmetic changes. They all have rather poor reliability, including poor frame spacing. Pentacon Six In 1959 Kamera Werkstätten became VEB Kamera and KinoWerke Dresden. In 1964 they became VEB Pentacon and in 1970, Kombinat VEB Pentacon. With the unification of the East German photographic industry the Praktisix was modified to become the Pentacon Six. Frame spacing was improved through the use of a roller with teeth that is turned by the film as it advances; when the correct length of f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
