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20-436: The Sigma DP1x is a large sensor digital compact camera announced by Sigma Corporation on February 20, 2010. This camera-related article is a stub . You can help Misplaced Pages by expanding it . Sigma Corporation Sigma Corporation ( 株式会社シグマ , Kabushiki-gaisha Shiguma ) is a Japanese company , manufacturing cameras , lenses , flashes and other photographic accessories. All Sigma products are produced in

40-749: A new flagship DSLR camera, the SD1 . SD1 features a new 46MP Foveon X3 sensor with 1.5x crop, as opposed to the 1.7x crop of previous models. All Sigma SLR, DSLR, and mirrorless cameras use the Sigma SA mount , which is mechanically similar to the Pentax K mount and electrically an adaptation of the Canon EF lens mount lens control system. Sigma also produces the DP series of high-end compact digital cameras . The Foveon APS-C sized sensors are similar to those used in

60-407: A photograph takes up such a small amount of space that its presence can often have little negative impact on the overall composition. When using an ultra wide-angle lens, the sky often constitutes a very large portion of the frame, and may need to be darkened for the image to appear balanced. This is often achieved through the use of a gradient filter. Note that a polarizing filter, which also darkens

80-501: Is close to or more than 180 degrees in at least one direction. For example, a "diagonal fish eye" would have a viewing angle of at least 180 degrees within the diagonals of the frame. A "circular fisheye" would represent the image in the form of a circle. Rectilinear ultra-wide angle lenses are used in photography and cinematography sometimes to achieve three-dimensional perspective distortion instead of simply two-dimensional barrel distortion. A notable, signature employment for this purpose

100-424: Is frequently seen in the films of Terry Gilliam , for instance. The DOF afforded by an ultra wide-angle lens is very great. Therefore, the photographer has the ability to keep much or almost all of the scene in focus, with respect to the hyperfocal distance of the lens. Thanks to the small focal length, these lenses can shoot longer exposures without fear of camera shake in the image. (In longer lenses camera shake

120-406: Is multiplied by the zoom factor, but in shorter lenses it is much less apparent). This means that the photographer can afford to use a much smaller aperture if they choose, and still retain a balanced image. With such a large visual angle, it can be very difficult at times to keep undesired objects such as light sources out of the image. However this does not always pose a problem, as even the sun in

140-581: The Leica L-Mount . A new full-frame mirrorless camera, Sigma FP, was launched in 2019 along with a range of L-Mount lenses and adapters. Sigma is the world's largest independent lens manufacturer and is a family-owned business. Sigma has made a number of film SLR cameras, including the SA-300, SA-5, SA-7 and SA-9. Their latest consumer digital SLR is the SD15 . During photokina 2010 , Sigma announced

160-772: The Sigma SD Quattro and SD Quattro H , use the Foveon Quattro sensor, an updated version of the Foveon X3. All use the SA lens mount . The Sigma DP series of high-end compact P&S cameras also use the Foveon Quattro sensor, which gives them a much larger sensor than other cameras of this type. In September 2018 Sigma became one of the founding members of the L-Mount Alliance ; it announced that it will cease to develop SA-mount cameras and instead use

180-551: The telephoto DP3. In February 2016, Sigma announced two new mirrorless cameras—the SD Quattro and SD Quattro H . Both cameras use the full-depth Sigma SA mount, allowing the use of existing SA-mount lenses, and also use Foveon Quattro sensors. The SD Quattro uses an APS-C sensor with 19.6 MP in the top layer, while the SD Quattro H uses an APS-H (1.35x crop) sensor with 25.5 MP in the top layer. The company claims that

200-567: The DSLR line. The current line makes use of the Quattro sensor, a variant of the Foveon design that has a higher resolution top layer and lower resolution lower layers combined into a final image that is claimed to be equivalent to a 39 megapixel color filter array image. The four compact cameras are differentiated by their fixed prime lens, with the ultra wide DP0, the wide DP1, the normal DP2 and

220-517: The Foveon Quattro technology produces a level of detail equivalent to that of a Bayer sensor with twice the pixel count. Sigma produces multiple software packages for use with their cameras and lenses. Sigma makes autofocus lenses for the Sigma SA , Canon EF , Nikon F , Fujifilm X , Minolta / Sony α , Pentax K and Four Thirds lens mounts . Each lens may not be available in all mounts, and may lack certain features (such as HSM) on certain mounts. In August 2013, Sigma announced that starting

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240-561: The Quantaray name, which have been sold exclusively by Ritz Camera . Similarly, Sigma lenses were sold exclusively by the former Wolf Camera , but following the merger of Wolf and Ritz, both brands could be purchased. Sigma's digital SLRs , the SD9 , SD10 , SD14 and SD15 , plus the latest SD1 are unusual in their use of the Foveon X3 image sensor . The company's mirrorless cameras,

260-606: The company's own Aizu factory in Bandai , Fukushima , Japan . Although Sigma produces several camera models, the company is best known for producing high-quality lenses and other accessories that are compatible with the cameras produced by other companies. The company was founded in 1961 by Michihiro Yamaki, who was Sigma's CEO until his death at age 78 in 2012. Sigma products work with cameras from Canon , Nikon , Fujifilm , Pentax , Sony , Olympus and Panasonic , as well as their own cameras. Sigma has also made lenses under

280-430: The edge of images (as the viewing angle increases). However, with modern technology and understanding of optics, ultra wide-angle lenses can these days eliminate distortion almost completely. Smartphones began incorporating ultra wide angle lens on rear cameras in the mid 2010s. The first models being LG’s G5 and V20 in 2016. Longer lenses magnify the subject more, apparently compressing distance and (when focused on

300-458: The following month, it would offer a mount conversion service for its newest "Global Vision" lenses—those with either an "A" (Art), "C" (Contemporary), or "S" (Sport) as part of their model name. For a cost that varies with lens and market—from $ 80 to $ 250 in the U.S., not including shipping costs—owners can send their lenses to their local Sigma company, which in turn sends them to Japan for mount replacement, including calibration and optimization for

320-422: The foreground) blurring the background because of their shallower depth of field . Wider lenses tend to magnify distance between objects while allowing greater depth of field. Another result of using a wide-angle lens is a greater apparent perspective distortion when the camera is not aligned perpendicularly to the subject: parallel lines converge at the same rate as with a normal lens , but converge more due to

340-640: The new camera system. Lenses designed for DSLRs can be converted to Canon EF, Nikon F, Pentax K, Sigma SA, or Sony A mounts; those designed for MILCs can be converted to Micro Four Thirds or Sony E-mount. In 2011, Nikon filed a suit against Sigma, alleging it had violated patents relating to Nikon's "Vibration Reduction" image stabilisation technology. In 2015, the suit ended through settlement, with no details disclosed. Ultra wide angle lens Ultra-wide angle lenses come in two varieties: Fisheye lenses with curvilinear barrel distortion , and rectilinear lenses which are designed so that straight lines in

360-399: The scene will render straight (uncurved) in the photographic image and thus lack the extreme distortion that is characteristic of a fisheye lens. Neither denotes a particular range of focal lengths, the difference is only whether distortion is present or not. However, the shorter the focal length, the more difficult it is to implement rectilinear correction. In fisheye lenses, the visual angle

380-451: The sky, will often give uneven results when used on an ultra-wide angle lens. The oldest "lenses", pinholes, used in pinhole cameras , keep perspective accurately. In images made using this technique, there is little or no distortion due to the rectilinear propagation of light. For a long time it was thought that only symmetrical optical diagrams could ensure the geometrically precise transfer of light without distortion becoming apparent near

400-402: The wider total field. For example, buildings appear to be falling backwards much more severely when the camera is pointed upward from ground level than they would if photographed with a normal lens at the same distance from the subject, because more of the subject building is visible in the wide-angle shot. Because different lenses generally require a different camera–subject distance to preserve

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