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Soft Focus
In photography, soft focus is a lens flaw, in which the lens forms images that are blurred due to uncorrected spherical aberration. A soft focus lens deliberately introduces spherical aberration which blurs fine texture in the image while retaining sharp edges across areas of high contrast; it is not the same as an out-of-focus image, and the effect cannot be achieved simply by defocusing a sharp lens. Soft focus is also the name of the style of photograph produced by such a lens. Photography Effect Soft focus has been described as "an image that is in focus but has a halo of out-of-focus images around it." The first deliberate use of undercorrected spherical aberration, resulting in halos around highlights (also known as "pearly" highlights), is thought to have been by French pictorialists around 1900, spreading to the United States, where these lenses were most popular between 1910 and 1930. Noted practitioners of soft focus photography include Julia Margaret Cameron, Bob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canon EF 135mm Lens
EF 135mm 2L USM The Canon EF 135mm 2L USM is a short-to-medium telephoto lens. The "135/2" is mainly used for portrait photography and for indoor sports, where the lighting is often poor. The lens speed, fast aperture makes the lens ideal for both of these applications. Among Canon (company), Canon photographers, the lens is highly regarded for its sharpness, contrast, and color rendition. The lens is also popular because it is very sharp at its maximum aperture of 2, allowing the photographer to throw the background out of focus while recording a lot of detail on the primary subject. This gives the photographer fine-grained control over depth of field. The EF 135mm 2L USM lens offers internal focus lens, internal focus; the length does not change while focusing. The lens is compatible with the Canon Extender EF teleconverters. EF 135mm 2.8 with Softfocus The Canon EF 135mm 2.8 with Softfocus is a soft focus prime lens introduced by Canon Inc. in 1987 designed for portrait ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bokeh
In photography, bokeh ( or ; ) is the aesthetic quality of the blur produced in out-of-focus parts of an image, whether foreground or background or both. It is created by using a wide aperture lens. Some photographers incorrectly restrict use of the term bokeh to the appearance of bright spots in the out-of-focus area caused by circles of confusion. Bokeh has also been defined as "the way the lens renders out-of-focus points of light". Differences in lens aberrations and aperture shape cause very different bokeh effects. Some lens designs blur the image in a way that is pleasing to the eye, while others produce distracting or unpleasant blurring ("good" and "bad" bokeh, respectively). Photographers may deliberately use a shallow focus technique to create images with prominent out-of-focus regions, accentuating their lens's bokeh. Bokeh is often most visible around small background highlights, such as specular reflections and light sources, which is why it is ofte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Double Gauss Lens
The double Gauss lens is a compound lens used mostly in camera lenses that reduces optical aberrations over a large focal plane. Design The earliest double Gauss lens, patented by Alvan Graham Clark in 1888, consists of two symmetrically-arranged Gauss lenses. Each Gauss lens is a two-element achromatic lens with a positive meniscus lens on the object side and a negative meniscus lens on the image side. In Clark's symmetric arrangement, this makes four elements in four groups: two positive meniscus lenses on the outside with two negative meniscus lenses inside them. The symmetry of the system and the splitting of the optical power into many elements reduces the optical aberrations within the system. There are many variations of the design. Sometimes extra lens elements are added. The basic lens type is one of the most developed and used photographic lenses. The design forms the basis for many camera lenses in use today, especially the wide-aperture standard lenses used with 35& ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cooke Triplet
The ''Cooke triplet'' is a photographic lens designed and patented in 1893 by Dennis Taylor who was employed as chief engineer by T. Cooke & Sons of York. It was the first lens system that allowed the elimination of most of the optical distortion or aberration at the outer edge of the image. The ''Cooke triplet'' is noted for being able to correct the five Seidel aberrations. The compound lens design consists of three air-spaced simple lens elements: two biconvex (positive) lenses surrounding a biconcave (negative) lens in the middle. It is one of the most important objective designs in the history of photography. Design According to Taylor, the lens design was derived by considering a cemented achromatic doublet consisting of one thin negative element and one thin positive element, both of equal power; such a doublet would result in a compound lens with zero net power but also a flat field of focus. However, by separating the elements, the resulting air gap would act a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tessar
The ''Tessar'' is a photographic lens design conceived by the German physicist Dr. Paul Rudolph in 1902 while he worked at the Zeiss optical company and patented by Zeiss in Germany; the lens type is usually known as the Zeiss ''Tessar''. Since its introduction, millions of ''Tessar'' and ''Tessar''-derived lenses have been manufactured by Zeiss and other manufacturers, and are still produced as excellent intermediate aperture lenses. The ''Tessar'' design uses four spherical lens elements in three groups, one positive crown glass element at the front, one negative flint glass element at the center and a negative concave flint glass element cemented with a positive convex crown glass element at the rear. History File:Rudolph US444714A (Protar, 1890).svg, Zeiss ''Protar'' (aka ''Anastigmat''; Rudolph, 1890) File:Taylor US568052A (Cooke Triplet, 1893 Fig 11).svg, Cooke ''Triplet'' ( Taylor, 1893) File:Aldis GB16640-95 (Stigmatic, 1895).svg, Dallmeyer ''Stigmatic'' (Aldis, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minolta Varisoft Rokkor 85mm F/2
was a Japanese manufacturer of cameras, lenses, camera accessories, photocopiers, fax machines, and laser printers. Minolta Co., Ltd., which is also known simply as Minolta, was founded in Osaka, Japan, in 1928 as . It made the first integrated autofocus 35 mm SLR camera system. In 1931, the company adopted its final name, an acronym for "Mechanism, Instruments, Optics, and Lenses by Tashima". In 2003, Minolta merged with Konica to form Konica Minolta. On 19 January 2006, Konica Minolta announced that it was leaving the camera and photo business, and that it would sell a portion of its SLR camera business to Sony as part of its move to pull completely out of the business of selling cameras and photographic film. History Milestones *1928: establishes Nichi-Doku Shashinki Shōten ("Japanese-German photo company," the precursor of Minolta Co., Ltd.). *1929: Marketed the company's first camera, the "Nifcarette" (ニフカレッテ). *1937: The Minolta Flex is Japan's seco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apodization
In signal processing, apodization (from Greek "removing the foot") is the modification of the shape of a mathematical function. The function may represent an electrical signal, an optical transmission, or a mechanical structure. In optics, it is primarily used to remove Airy disks caused by diffraction around an intensity peak, improving the focus. Apodization in electronics Apodization in signal processing The term apodization is used frequently in publications on Fourier-transform infrared (FTIR) signal processing. An example of apodization is the use of the Hann window in the fast Fourier transform analyzer to smooth the discontinuities at the beginning and end of the sampled time record. Apodization in digital audio An apodizing filter can be used in digital audio processing instead of the more common brick-wall filters, in order to reduce the pre- and post- ringing that the latter introduces. Apodization in mass spectrometry During oscillation within an Orbit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
US4124276A (Okano Nakamura & Ogura, 1975)
U.S. Route 41, also U.S. Highway 41 (US 41), is a major north–south United States Numbered Highway that runs from Miami, Florida, to the Upper Peninsula of Michigan. Until 1949, the part in southern Florida, from Naples to Miami, was US 94. The highway's southern terminus is in the Brickell neighborhood of Downtown Miami at an intersection with Brickell Avenue ( US 1), and its northern terminus is east of Copper Harbor, Michigan, at a modest cul-de-sac near Fort Wilkins Historic State Park at the tip of the Keweenaw Peninsula. US 41 is closely paralleled by Interstate 75 (I-75) from Naples, Florida, all the way through Georgia to Chattanooga, Tennessee. Route description , - , FL , , - , GA , , - , TN , , - , KY , , - , IN , , - , IL , , - , WI , , - , MI , , - class="sortbottom" , Total , Florida In Florida, US 41 is paralleled by Interstate 75 all the way from Miami to Georgia (on the northern border), and I-75 has largel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nicola Perscheid
Nicola Perscheid (3 December 1864 – 12 May 1930) was a German photographer. He is primarily known for his artistic portrait photography. He developed the "Perscheid lens", a soft focus lens for large format portrait photography. Life and career Perscheid was born as Nikolaus Perscheid in near Koblenz, Kingdom of Prussia, where he also went to school. At the age of 15, he began an apprenticeship as a photographer. Subsequently, Perscheid earned his living as an itinerant photographer; he worked, amongst other places, in Saarbrücken, Trier, and Colmar, but also in Nice, Vienna, or Budapest. In Klagenfurt in Austria he finally found a permanent position and on 1 March 1887, he became a member of the Photographic Society of Vienna (''Wiener Photographische Gesellschaft''). In 1889, he moved to Dresden, where he initially worked in the studio of Wilhelm Höffert (1832–1901), a well-known studio in Germany at that time, before opening his own studio in Görlitz on 6 June 1891. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shōji Ueda
__NOTOC__ was a Japanese photographer from Tottori Prefecture, Tottori, best known for his distinctive, dreamlike black-and-white images with staged figures, taken on the Tottori Sand Dunes, Tottori sand dunes. The term ''Ueda-chō'' (Ueda-tone) has been used to refer to his cool and mysterious atmospheric style. Ueda began using posed figures and objects in his photographs in 1939, but would be forced to cease his production due to Japan's participation in World War II. His surreal ''Sand Dune'' series, of which the first images were published 1949, was overshadowed by the predominance of social realism, a major trend in Japanese post-war photography. His oeuvre was reconsidered by critics in 1971 after the publication of the widely-appreciated photobook ''Warabe Goyomi'' (Children the Year Round), containing images of children which masterfully balanced social realism and the playfulness of Ueda's posed pictures. Since the 1970s, his work has won him international renown, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vest Pocket Kodak
The Vest Pocket Kodak (VPK), also known as the Soldier's Kodak, is a line of compact folding cameras introduced by Eastman Kodak in April 1912 and produced until 1934, when it was succeeded by the Kodak Bantam. Because the VPK uses 127 film, it is more compact than contemporary folding cameras using 120 film and larger sheet film formats offered by Kodak; measuring approximately when stowed, it could be carried in a vest pocket, as the name suggests. Design The basic design of the Vest Pocket Kodak has a lens on a flat platform which extends manually from the body, sealed by a light-tight bellows. Several different lenses were offered, with cameras fitted with upgraded lenses named "Vest Pocket Kodak Special", and numerous cosmetic variations exist. Popular competitive cameras at the time were the Houghton Ensignettes, which used films of similar but not identical size, designated 128 and 129. The Vest Pocket Kodak outcompeted the Ensignettes, and Houghton introduced a new 127- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
