|
Ultra Wide Angle Lens
An ultra wide-angle lens is a Photographic lens, lens whose focal length is shorter than that of an average wide-angle lens, providing an even wider view. The term denotes a different range of lenses, relative to the size of the sensor in the camera in question. * For 1" any 9mm or shorter is considered ultra wide angle. * For Four Thirds system, 4/3" any 10 mm or shorter lens is considered ultra wide angle. * For APS-C any lens shorter than 15 mm. * For 35mm format, 35mm film or full-frame sensor any lens shorter than 24 mm * For Medium format (film), 6x4.5 cm any lens shorter than 41 mm * For Medium format (film), 6x6 cm and Medium format (film), 6x7 cm any lens shorter than 56 mm Features 'Fisheye' and rectilinear lenses Ultra-wide angle lenses come in two varieties: Fisheye lenses with curvilinear perspective, curvilinear barrel distortion, and rectilinear lenses which are designed so that straight lines in the scene will render straight (uncurv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leitz Elmarit R 19
Leitz may refer to several German companies: *Esselte Leitz GmbH & Co KG, founded by Louis Leitz in 1896, a German manufacturer of office products **Louis Leitz (1846–1918), German inventor and founder of Esselte Leitz GmbH & Co KG *Ernst Leitz GmbH, German firm now divided into: **Leica Camera, manufacturer of cameras **Leica Geosystems, manufacturer of geodetic equipment **Leica Microsystems, manufacturer of microscopes and owner of the Leica brand **Leica Biosystems, a cancer diagnostics company {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Curvilinear Perspective
Curvilinear perspective, also five-point perspective, is a graphical projection used to draw 3D objects on 2D surfaces, for which (straight) lines on the 3D object are projected to curves on the 2D surface that are typically not straight (hence the qualifier "curvilinear"). It was formally codified in 1968 by the artists and art historians André Barre and Albert Flocon in the book ''La Perspective curviligne'',Albert Flocon and André Barre, ''La Perspective curviligne'', Flammarion, Éditeur, Paris, 1968 which was translated into English in 1987 as ''Curvilinear Perspective: From Visual Space to the Constructed Image'' and published by the University of California Press.Albert Flocon and André Barre, ''Curvilinear Perspective: From Visual Space to the Constructed Image'', (Robert Hansen, translator), University of California Press, Berkeley and Los Angeles, California, 1987 Curvilinear perspective is sometimes colloquially called fisheye perspective, by analogy to a fisheye ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Normal Lens
In photography and cinematography, a normal lens is a lens that reproduces a field of view that appears "natural" to a human observer. In contrast, depth compression and expansion with shorter or longer focal lengths introduces noticeable, and sometimes disturbing, distortion. Mimicking human vision Photographic technology employs different physical methods from the human eye in order to capture images. Thus, manufacturing optics which produce images that appear natural to human vision is problematic. The eye has a nominal focal length of approximately 17 mm, but it varies with accommodation. The nature of human binocular vision, which uses two lenses instead of a single one, and post-processing by the cortex is very different from the process of making and rendering a photograph, video or film, and then looking at those. The structure of the human eye has a concave retina, rather than a flat sensor. This produces effects observed by Abraham Bosse who, in his 1665 illust ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perspective Distortion (photography)
In photography and cinematography, perspective distortion is a warping or transformation of an object and its surrounding area that differs significantly from what the object would look like with a normal lens, normal focal length, due to the relative scale of nearby and distant features. Perspective distortion is determined by the relative distances at which the image is captured and viewed, and is due to the angle of view of the image (as captured) being either wider or narrower than the angle of view at which the image is viewed, hence the apparent relative distances differing from what is expected. Related to this concept is axial magnification – the perceived depth of objects at a given magnification. Perspective distortion takes two forms: ''extension distortion'' and ''compression distortion,'' also called ''wide-angle distortion'' and ''long-lens'' or ''telephoto distortion,'' when talking about images with the same field size. Extension or wide-angle distortion can be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Focal Length
The focal length of an Optics, optical system is a measure of how strongly the system converges or diverges light; it is the Multiplicative inverse, inverse of the system's optical power. A positive focal length indicates that a system Convergence (optics), converges light, while a negative focal length indicates that the system Divergence (optics), diverges light. A system with a shorter focal length bends the Ray (optics), rays more sharply, bringing them to a focus in a shorter distance or diverging them more quickly. For the special case of a thin lens in air, a positive focal length is the distance over which initially Collimated beam, collimated (parallel) rays are brought to a Focus (optics), focus, or alternatively a negative focal length indicates how far in front of the lens a point source must be located to form a collimated beam. For more general optical systems, the focal length has no intuitive meaning; it is simply the inverse of the system's optical power. In mos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LG V20
LG V20 is an Android phablet smartphone manufactured by LG Electronics, in its LG V series, succeeding the LG V10 released in 2015. Unveiled on September 6, 2016, it was the first phone with the Android Nougat operating system. Like the V10, the V20 has a secondary display panel near the top of the device that can display additional messages and controls, and a quad DAC for audio. The V20 has a user-replaceable battery, unlike its successor, the LG V30, unveiled on 31 August 2017. Specifications The LG V20 was released in 2016 as LG's second V-series flagship smartphone. Its list of specifications includes the Qualcomm Snapdragon 820 system-on-chip, 4GB of RAM and 64GB of storage, 5.7-inch Quad HD (2560×1440) IPS LCD with additional secondary display, dual 16MP (75°, f/1.8) + 8MP (135°, f/2.4) rear cameras, 5MP (120°, f/1.9) front-facing camera, and a 3,200mAh removable battery. Hardware The LG V20 continues the user-friendly hardware access design of the LG G5 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LG G5
The LG G5 is an Android smartphone developed by LG Electronics as part of the LG G series. It was announced during Mobile World Congress as the successor to the 2015 LG G4. The G5 is distinguished from its predecessors by its aluminum chassis and a focus on modularity. Its lower housing, which holds the user-replaceable battery, can be slid from the bottom of the device, and replaced by alternative add-on modules that provide additional functions. Two modules are available: a camera grip, and a high-fidelity audio module with DAC. A lower-spec variation, dubbed the LG G5 SE, is available in some markets. The G5 received mixed reviews. The device was praised for its shift to all-metal construction, while maintaining its removable battery. However, the modular accessory system was criticized for its limited use cases and for its inability to perform hot swapping. LG's software, too, was panned for the quality of its customizations. Specifications Hardware The G5 is construct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinhole Camera
A pinhole camera is a simple camera without a lens but with a tiny aperture (the so-called ''Pinhole (optics), pinhole'')—effectively a light-proof box with a small hole in one side. Light from a scene passes through the aperture and projects an inverted image on the opposite side of the box, which is known as the camera obscura effect. The size of the images depends on the distance between the object and the pinhole. A Worldwide Pinhole Photography Day is observed on the last Sunday of April, every year. History Camera obscura The camera obscura or pinhole image is a natural optical phenomenon. Early known descriptions are found in the Chinese Mozi (book), Mozi writings (circa 500 BCE) and the Aristotelian ''Problems (Aristotle), Problems'' (circa 300 BCE – 600 CE). Ibn al-Haytham (965–1039), an Physics in the medieval Islamic world, Arab physicist also known as Alhazen, described the camera obscura effect. Over the centuries others started to experiment with it, main ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terry Gilliam
Terrence Vance Gilliam ( ; born 22 November 1940) is an American-British filmmaker, comedian, collage film, collage animator, and actor. He gained stardom as a member of the Monty Python comedy troupe alongside John Cleese, Eric Idle, Michael Palin, Terry Jones, and Graham Chapman. Together they collaborated on the sketch comedy, sketch series ''Monty Python's Flying Circus'' (1969–1974) and the films ''Monty Python and the Holy Grail'' (1975, also co-directed), ''Monty Python's Life of Brian, Life of Brian'' (1979) and ''Monty Python's The Meaning of Life, The Meaning of Life'' (1983). In 1988, they received the British Academy Film Awards, BAFTA Award for BAFTA Outstanding British Contribution to Cinema Award, Outstanding British Contribution to Cinema. In 2009, Gilliam received the BAFTA Fellowship for lifetime achievement. Gilliam transitioned to directing serious films with themes exploring imagination and oppositions to bureaucracy and authoritarianism. His films are some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rectilinear Lens
In photography, a rectilinear lens is a photographic lens that yields images where straight features, such as the edges of walls of buildings, appear with straight lines, as opposed to being curved. In other words, it is a lens with little or no barrel or pincushion distortion. At particularly wide angles, however, the rectilinear perspective will cause objects to appear increasingly stretched and enlarged as they near the edge of the frame. These types of lenses are often used to create forced perspective effects. The most famous example is the Rapid Rectilinear Lens developed by John Henry Dallmeyer in 1866. It allowed distortionless photos to be taken quickly for the first time, and was a standard lens design for 60 years. As of 2020, the Laowa 9mm f/5.6 lens is the world's widest rectilinear lens for full frame cameras. The vast majority of video and still cameras use lenses that produce nearly rectilinear images. A popular alternative type of lens is a fisheye lens ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barrel Distortion
In geometric optics, distortion is a deviation from rectilinear projection; a projection in which straight lines in a scene remain straight in an image. It is a form of optical aberration that may be distinguished from other aberrations such as spherical aberration, coma, chromatic aberration, field curvature, and astigmatism in a sense that these impact the image sharpness without changing an object shape or structure in the image (e.g., a straight line in an object is still a straight line in the image although the image sharpness may be degraded by the mentioned aberrations) while distortion can change the object structure in the image (so named as distortion). Radial distortion Although distortion can be irregular or follow many patterns, the most commonly encountered distortions are radially symmetric, or approximately so, arising from the symmetry of a photographic lens. These ''radial distortions'' can usually be classified as either ''barrel'' distortions or ''pincus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fisheye Lens
A fisheye lens is an ultra wide angle lens, ultra wide-angle lens that produces strong Distortion (optics), visual distortion intended to create a wide panorama, panoramic or Sphere#Hemisphere, hemispherical image. Fisheye lenses achieve extremely wide angle of view, angles of view, well beyond any rectilinear lens. Instead of producing images with straight lines of perspective (rectilinear lens, rectilinear images), fisheye lenses use a special mapping ("distortion"; for example: Lambert azimuthal equal-area projection, equisolid angle, see below), which gives images a characteristic convex non-rectilinear appearance. The term ''fisheye'' was coined in 1906 by American physicist and inventor Robert W. Wood based on how a fish would see an ultrawide hemispherical view from beneath the water (a phenomenon known as Snell's window). Their first practical use was in the 1920s for use in meteorology to study cloud formation giving them the name ''whole-sky lenses''. The angle of view ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
