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ASA (film Speed)
Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. A closely related ISO system is used to describe the relationship between exposure and output image lightness in digital cameras. Relatively insensitive film, with a correspondingly lower speed index, requires more exposure to light to produce the same image density as a more sensitive film, and is thus commonly termed a ''slow film''. Highly sensitive films are correspondingly termed ''fast films''. In both digital and film photography, the reduction of exposure corresponding to use of higher sensitivities generally leads to reduced image quality (via coarser film grain or higher image noise of other types). In short, the higher the sensitivity, the grainier the image will be. Ultimately sensitivity is limited by the quantum efficiency of the film or sensor. Film speed measurement systems Histor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photographic Film
Photographic film is a strip or sheet of transparent film base coated on one side with a gelatin photographic emulsion, emulsion containing microscopically small light-sensitive silver halide crystals. The sizes and other characteristics of the crystals determine the sensitivity, contrast, and image resolution, resolution of the film. The emulsion will gradually darken if left exposed to light, but the process is too slow and incomplete to be of any practical use. Instead, a very short exposure (photography), exposure to the image formed by a camera lens is used to produce only a very slight chemical change, proportional to the amount of light absorbed by each crystal. This creates an invisible latent image in the emulsion, which can be chemically photographic processing, developed into a visible photograph. In addition to visible light, all films are sensitive to ultraviolet light, X-rays, gamma rays, and particle radiation, high-energy particles. Unmodified silver halide crys ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hurter And Driffield
Ferdinand Hurter (1844–1898) and Vero Charles Driffield (1848–1915) were nineteenth-century photographic scientists who brought quantitative scientific practice to photography through the methods of sensitometry and densitometry. Among their other innovations was a photographic exposure estimation device known as an actinograph. See also * H&D speed numbers, originally described in 1890, for film speed Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. A closely related ISO system is used to describe the relations ... measurements References External links A brief history of Hurter and Driffield by Ron Callender in ''Encyclopedia of Nineteenth-century Photography'' 2008 pp.732-4 History of photography {{photo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agfacolor Neu - 7300960484
An Agfacolor slide dated 1937 from café in Oslo, Norway. An Agfacolor slide dated 1937 from Paris, France. An Agfacolor slide dated 1938 from Hungary. An Agfacolor slide dated 1938 from Zakopane in Poland. An Agfacolor slide dated 1938 from Sweden. Budapest in Hungary, 1939. An Agfacolor slide dating from the early 1940s. While the colors themselves have held up well, damage visible includes dust and Newton's rings. Swedish battleship HM Pansarskepp Gustaf V (An Agfacolor slide dated until 1957). Agfacolor was the name of a series of color film products made by Agfa of Germany. The first Agfacolor, introduced in 1932, was a film-based version of their Agfa-Farbenplatte (Agfa color plate), a "screen plate" product similar to the French Autochrome. In late 1936, Agfa introduced Agfacolor Neu (New Agfacolor), a pioneering color film of the general type still in use today. The new Agfacolor was originally a reversal film used for making "slides", home movies and short do ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Decibel
The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of 101/10 (approximately ) or root-power ratio of 10 (approximately ). The unit expresses a relative change or an absolute value. In the latter case, the numeric value expresses the ratio of a value to a fixed reference value; when used in this way, the unit symbol is often suffixed with letter codes that indicate the reference value. For example, for the reference value of 1 volt, a common suffix is " V" (e.g., "20 dBV"). Two principal types of scaling of the decibel are in common use. When expressing a power ratio, it is defined as ten times the logarithm in base 10. That is, a change in ''power'' by a factor of 10 corresponds to a 10 dB change in level. When expressing root-power quantities, a change in ''ampl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scheiner
Scheiner is a German surname. Notable people with the surname include: *Artuš Scheiner, Czech painter and illustrator *Christoph Scheiner, Jesuit priest, physicist and astronomer (born c. 1573) *David Scheiner (born 1938), American physician and activist *Elliot Scheiner, record producer and record engineer *Julius Scheiner (1858, Cologne – 1913), German astronomer, astrophysicist and Jesuit *Rabbi Mordechai Scheiner *Rebecca Scheiner, German female stage director *Rabbi Yitzchok Scheiner See also *Scheiner (crater), lunar impact crater that lies to the west of the enormous walled plain Clavius, named after Christoph Scheiner *Shiner (surname) *Schein Schein is the surname of: * Charles Schein (1928–2003), French polymer chemist of Romanian origin * David D. Schein * Edgar Schein (born 1928), professor at the MIT Sloan School of Management * Johann Hermann Schein (1586–1630), German compose ... References {{surname, Scheiner German-language surnames Jewish surnam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dresden
Dresden (, ; Upper Saxon: ''Dräsdn''; wen, label=Upper Sorbian, Drježdźany) is the capital city of the German state of Saxony and its second most populous city, after Leipzig. It is the 12th most populous city of Germany, the fourth largest by area (after Berlin, Hamburg and Cologne), and the third most populous city in the area of former East Germany, after Berlin and Leipzig. Dresden's urban area comprises the towns of Freital, Pirna, Radebeul, Meissen, Coswig, Radeberg and Heidenau and has around 790,000 inhabitants. The Dresden metropolitan area has approximately 1.34 million inhabitants. Dresden is the second largest city on the River Elbe after Hamburg. Most of the city's population lives in the Elbe Valley, but a large, albeit very sparsely populated area of the city east of the Elbe lies in the West Lusatian Hill Country and Uplands (the westernmost part of the Sudetes) and thus in Lusatia. Many boroughs west of the Elbe lie in the foreland of the Ore Mounta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Congress Of Photography
International is an adjective (also used as a noun) meaning "between nations". International may also refer to: Music Albums * ''International'' (Kevin Michael album), 2011 * ''International'' (New Order album), 2002 * ''International'' (The Three Degrees album), 1975 *''International'', 2018 album by L'Algérino Songs * The Internationale, the left-wing anthem * "International" (Chase & Status song), 2014 * "International", by Adventures in Stereo from ''Monomania'', 2000 * "International", by Brass Construction from ''Renegades'', 1984 * "International", by Thomas Leer from ''The Scale of Ten'', 1985 * "International", by Kevin Michael from ''International'' (Kevin Michael album), 2011 * "International", by McGuinness Flint from ''McGuinness Flint'', 1970 * "International", by Orchestral Manoeuvres in the Dark from '' Dazzle Ships'', 1983 * "International (Serious)", by Estelle from '' All of Me'', 2012 Politics * Political international, any transnational organization of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emanuel Goldberg
Emanuel Goldberg ( he, עמנואל גולדברג; yi, עמנואל גאָלדבערג; russian: Эмануэль Гольдберг) (born: 31 August 1881; died: 13 September 1970) was an Israeli physicist and inventor. He was born in Moscow and moved first to Germany and later to Israel. He described himself as "a chemist by learning, physicist by calling, and a mechanic by birth." He contributed a wide range of theoretic and practical advances relating to light and media and was the founding head of Zeiss Ikon, the famous photographic products company in Dresden, Germany. His inventions include microdots, the Kinamo movie camera, the Contax 35 mm camera, a very early search engine, and equipment for sensitometry. Biography Goldberg was born in Moscow on 31 August 1881 (19 August 1881 in the Old Style, Julian calendar, sometimes given in error as 1 September) the son of Grigorii Ignat'evich Goldberg, a distinguished Colonel (Polkovnik) in the Tsar's military medical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deutsches Institut Für Normung
' (DIN; in English, the German Institute for Standardisation Registered Association) is the German national organization for standardization and is the German ISO member body. DIN is a German Registered Association ('' e.V.'') headquartered in Berlin. There are currently around thirty thousand DIN Standards, covering nearly every field of technology. History Founded in 1917 as the ' (NADI, "Standardisation Committee of German Industry"), the NADI was renamed ' (DNA, "German Standardisation Committee") in 1926 to reflect that the organization now dealt with standardization issues in many fields; viz., not just for industrial products. In 1975 it was renamed again to ', or 'DIN' and is recognised by the German government as the official national-standards body, representing German interests at the international and European levels. The acronym, 'DIN' is often incorrectly expanded as ' ("German Industry Standard"). This is largely due to the historic origin of the DIN as "NADI" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Josef Maria Eder
Josef Maria Eder (16 March 1855 – 18 October 1944) was an Austrian chemist who specialized in the chemistry of photography, and who wrote a comprehensive early history of the technical development of chemical photography. Life and work Eder was born in Krems an der Donau in 1855. He studied chemistry, physics and mathematics at the Vienna University of Technology and at the University of Vienna. In 1876, he received his PhD and in 1879, after his habilitation, became lecturer at the Vienna University of Technology. His research then was focused on the chemistry of photography. After spending some time at the Staatliche Gewerbeschule Vienna, he became lecturer at the Höhere Gewerbeschule Vienna. This change improved his possibilities for doing research. In the following years, Eder developed sensitized gelatin silver process. Orthochromatic photographic plates, in combination with a color filter counter-acting the plates' inhomogeneous sensitivity to light of different wavelength ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Julius Scheiner
Julius Scheiner (25 November 1858 – 20 December 1913) was a German astronomer, born in Cologne and educated at Bonn. He became assistant at the astrophysical observatory in Potsdam in 1887 and its observer in chief in 1898, three years after his appointment to the chair of astrophysics in the University of Berlin. Scheiner paid special attention to celestial photography and wrote ''Die Spektralanalyse der Gestirne'' (1890); ''Lehrbuch der Photographie der Gestirne'' (1897); ''Strahlung und Temperatur der Sonne'' (1899); ''Der Bau des Weltalls'' (1901); third edition (1909). In 1899 he began the publication of the ''Photographische Himmelskarte; Zone +31° bis +40° Deklination''. He is also credited with developing the first system for measuring the sensitivity of photographic emulsions in 1894,Martin Riat. ''Graphische Techniken - Eine Einführung in die verschiedenen Techniken und ihre Geschichte''. E-Book, 3. German edition, Burriana, spring 2006, based on a Catalan book: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GOST
GOST (russian: ГОСТ) refers to a set of international technical standards maintained by the ''Euro-Asian Council for Standardization, Metrology and Certification (EASC)'', a regional standards organization operating under the auspices of the Commonwealth of Independent States (CIS). All sorts of regulated standards are included, with examples ranging from charting rules for design documentation to recipes and nutritional facts of Soviet-era brand names. The latter have become generic, but may only be sold under the label if the technical standard is followed, or renamed if they are reformulated. The notion of GOST has certain significance and recognition in the countries of the standards' jurisdiction. The Russian government Federal Agency on Technical Regulating and Metrology (Rosstandart) has ''gost.ru'' as its website address. History GOST standards were originally developed by the government of the Soviet Union as part of its national standardization strategy. The w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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