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Pentax F 17–28mm Lens
The smc Pentax-F 17–28mm Fish-eye 3.5–4.5 is the first fisheye zoom lens, manufactured by Pentax for single-lens reflex cameras (SLRs) with a K lens mount. At its widest setting of 17mm, it affords a 180° diagonal angle of view images for all K-mount full-frame SLR cameras; at 28mm, the diagonal angle of view is reduced to 90° on the diagonal. Typical fisheye barrel distortion is evident at all focal lengths. A successor model, the Pentax DA 10-17mm lens, was introduced with the same view angles and closer focusing capability for APS-C cameras in 2006. History and design The lens was designed by Jun Hirakawa and a patent was applied for the design in 1994, granted in 1998. Longtime photography writer Herbert Keppler Herbert "Burt" Keppler (April 21, 1925 – January 4, 2008) was an American photographer, journalist, author and consultant. His career spanned 57 years, including 37 at ''Modern Photography'' and two decades at ''Popular Photography''. He wr ... was a n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentax
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] |
Fisheye Lens
A fisheye lens is an ultra wide-angle lens that produces strong visual distortion intended to create a wide panoramic or hemispherical image. Fisheye lenses achieve extremely wide angles of view, well beyond any rectilinear lens. Instead of producing images with straight lines of perspective ( rectilinear images), fisheye lenses use a special mapping ("distortion"; for example: 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 of a fisheye lens is usually between 100 and 180 degrees, although lenses covering up to 280 degrees exist (see below). Their focal lengths dep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zoom Lens
A zoom lens is a mechanical assembly of lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed-focal-length (FFL) lens (see prime lens). A true zoom lens, also called a parfocal lens, is one that maintains focus when its focal length changes. Most consumer zoom lenses do not maintain perfect focus, but are still parfocal designs. Most camera phones that are advertised as having optical zoom actually use a few cameras of different but fixed focal length, combined with digital zoom to make a hybrid system. The convenience of variable focal length comes at the cost of complexity – and some compromises on image quality, weight, dimensions, aperture, autofocus performance, and cost. For example, all zoom lenses suffer from at least slight, if not considerable, loss of image resolution at their maximum aperture, especially at the extremes of their focal length range. This effect is evident in the corners of the image, when displa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Single-lens Reflex Camera
A single-lens reflex camera (SLR) is a camera that typically uses a mirror and prism system (hence "reflex" from the mirror's reflection) that permits the photographer to view through the lens and see exactly what will be captured. With twin lens reflex and rangefinder cameras, the viewed image could be significantly different from the final image. When the shutter button is pressed on most SLRs, the mirror flips out of the light path, allowing light to pass through to the light receptor and the image to be captured. History File:Hasselblad 1600F.jpg, Medium format SLR by Hasselblad (Model 1600F), Sweden File:Zenza BRONICA S2 with ZENZANON 100mm F2.8.JPG, Medium format SLR by Bronica (Model S2), Japan. Bronica's later model—the Bronica EC—was the first medium format SLR camera to use an electrically operated focal-plane shutter File:Asahiflex600.jpg, The 1952 (Pentax) Asahiflex, Japan's first single-lens reflex camera. File:Contaflex BW 2.JPG, The Contaflex III a single- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentax K-mount
The Pentax K-mount, sometimes referred to as the "PK-mount", is a bayonet lens mount standard for mounting interchangeable photographic lenses to 35 mm single-lens reflex (SLR) cameras. It was created by Pentax in 1975, and has since been used by all Pentax 35 mm and digital SLRs and also the MILC Pentax K-01. A number of other manufacturers have also produced many K-mount lenses and K-mount cameras. Mounts The Pentax K-mount has undergone a number of evolutions over the years as new functionality has been added. In general, the term K-mount may refer to the original K-mount, or to all its variations. Originally designed by Zeiss for an alliance with Pentax, it was intended to be a common lens mount for a proposed series of cameras and lenses. However, the plan failed to work out and the two firms parted company amicably, but Pentax retained the lens mount and at least one Zeiss lens design for its own use. K-mount The original K-mount is a simple bayonet con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentax DA 10-17mm Lens
The smc Pentax-DA 10-17mm f/3.5-4.5 ED (IF) Fish-Eye lens is a fisheye zoom lens for the Pentax K-mount. It offers an up to 180 degree view, and allows quick shift focus (Pentax's term for giving the photographer the ability to manually focus the lens even when the camera is in autofocus mode without damaging the lens or camera). History and design A patent for the lens design was filed on 30 August 2005, and granted in 2008. The design is credited to Takayuki Ito and Jun Hirakawa. Pentax announced the lens on November 30, 2005, with availability to commence in January 2006. It was designed in conjunction with Tokina is a Japanese manufacturer of photographic lenses and CCTV security equipment. Lens designations * FX - Full frame * DX - cropped digital * AF - Auto-Focus * AT-X Pro - professional line (constant aperture zooms or primes) * AT-X - consumer lin ..., who would later market a self-branded version in Nikon AF-D and Canon EF mounts starting in October 2006. The 10–1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jun Hirakawa
Mr. Jun Hirakawa is a Japanese lens designer best known for creating the Pentax Pentax FA 43mm Limited lens, FA 43mm Limited and Pentax FA 77mm Limited lens, FA 77mm Limited lenses during his time at Pentax. Hirakawa said at the time that he regretted his "early retirement" from Pentax in 2010, around the time that Hoya Corporation, Hoya acquired the company, and was subsequently hired by Tamron. List of credited lens designs Hirakawa is credited with designing: * Pentax DA 10-17mm lens, DA 10-17mm f/3.5-4.5 Fisheye (co-developed with Takayuki Ito) * Pentax DA 14mm lens, DA 14mm f/2.8 * Pentax DA 40mm lens, DA 40mm f/2.8 Limited (based on the smc PENTAX-M 1:2.8 40mm) * DA 50-200 f/4-5.6 * Pentax DA 55-300mm lens, DA 55-300 f/4-5.8 * Pentax DA* 55mm lens, DA* 55mm f/1.4 * Pentax F 17-28mm lens, F 17-28mm f/3.5-4.5 Fisheye * F 35-80mm f/4-5.6 * F* 600mm f/4 * FA 28-105mm f/4-5.6 * Pentax FA 28mm lens, FA 28mm f/2.8 AL * FA 28mm f/2.8 SOFT * Pentax FA 35mm lens, FA 35mm f/2 * Pentax ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herbert Keppler
Herbert "Burt" Keppler (April 21, 1925 – January 4, 2008) was an American photographer, journalist, author and consultant. His career spanned 57 years, including 37 at ''Modern Photography'' and two decades at ''Popular Photography''. He wrote monthly columns and served in the former magazine as Editorial Director and Publisher, and in the latter magazine as Vice President and Publishing Director. Life and career Herbert Keppler was born in New York on April 21, 1925, to commercial photographer and illustrator Victor Keppler. He started in photography at the age of six and processed his own color photographs at the age of ten. He earned a Bachelor of Arts degree at Harvard University and was commissioned as an ensign in the U.S. Navy near the end of World War II. After the war, Herbert Keppler was a photojournalist for The Sun (New York) and worked for the Fairchild Fashion Media trade magazine Footwear News, but found his calling, when he in 1950 became an Associate Edit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentax K-mount Lenses
The Pentax K-mount, sometimes referred to as the "PK-mount", is a Bayonet mount, bayonet lens mount standard for mounting interchangeable photographic lenses to 135 film, 35 mm single-lens reflex (SLR) cameras. It was created by Pentax in 1975, and has since been used by all Pentax 135 film, 35 mm and digital Digital single-lens reflex camera, SLRs and also the Mirrorless interchangeable-lens camera, MILC Pentax K-01. A number of other manufacturers have also produced many K-mount lenses and K-mount cameras. Mounts The Pentax K-mount has undergone a number of evolutions over the years as new functionality has been added. In general, the term K-mount may refer to the original K-mount, or to all its variations. Originally designed by Carl Zeiss AG, Zeiss for an alliance with Pentax, it was intended to be a common lens mount for a proposed series of cameras and lenses. However, the plan failed to work out and the two firms parted company amicably, but Pentax retained th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fisheye Lenses symbol
{{Disambiguation ...
Fisheye may refer to: * The eye providing vision in fish or other aquatic creature resembling a fish * Fisheye lens, an ultra wide-angle lens used in photography * Fisheye (''Sailor Moon''), a character from the anime ''Sailor Moon'' * ''Fisheye'' (album), the second album by the alternative rock band Callalily * FishEye (software), a revision-control browser by Atlassian Software Systems * Fish Eye Marine Park in Piti Bomb Holes Marine Preserve, Guam * A blemish of spray painting, caused by contamination with oil or water * ◉, a circled dot The circled dot, circumpunct, or circle with a point at its centre may refer to one or more of these glyphs or articles Solar system *One of many solar symbols used to represent the Sun * (Planet symbol in astronomy) **Gold (Alchemical_symbols# ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
