Pentax 645
The Pentax 645 is a medium format single-lens reflex system camera manufactured by Pentax. It was introduced in 1984, along with a complementary line of lenses. It captures images nominally 6 cm × 4.5 cm on 120, 220, and 70 mm film, though the actual size of the images is 56 mm × 41.5 mm. Models 645 The 645 is the original model introduced in 1984. It has a built-in 1.5 frames per second motor drive, center-weighted TTL metering, multiple automatic exposure modes, and a small LCD screen on the top plate which indicates mode, exposure compensation, and exposure count. Unlike comparable medium-format cameras, the 645 does not have an interchangeable back system. Instead, the film is loaded into holders, which are then inserted into the rear of the camera. The holders cannot be removed until an entire roll is shot. The crop factor vs. a 35 mm camera is .62, The actual film image is 2.7 times larger than that of standard double format 35mm film. ...
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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 ...
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Full-frame DSLR
A full-frame DSLR is a digital single-lens reflex camera (DSLR) with a 35 mm image sensor format (). Historically, 35 mm was one of the standard film formats, alongside larger ones, such as medium format and large format. The full-frame DSLR is in contrast to full-frame mirrorless interchangeable-lens cameras, and DSLR and mirrorless cameras with smaller sensors (for instance, those with a size equivalent to APS-C-size film), much smaller than a full 35 mm frame. Many digital cameras, both compact and SLR models, use a smaller-than-35 mm frame as it is easier and cheaper to manufacture imaging sensors at a smaller size. Historically, the earliest digital SLR models, such as the Nikon NASA F4 or Kodak DCS 100, also used a smaller sensor. Kodak states that 35 mm film (note: in " Academy format", 21.0 mm × 15.2 mm) has the equivalent of 6K horizontal resolution, according to a senior vice president of IMAX. This equates to 10K horizontal resolution in ...
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List Of Pentax Products
The following is a partial list of products manufactured under the Pentax brand. Film cameras 35 mm SLR cameras M37 screw mount Cameras using the M37 lens mount. * Ashiflex I (1952–1953) * Asahiflex Ia (1953–1954) — also sold as the Tower 23 * Asahiflex IIb (1954–1957) — also sold as the Tower 23 * Asahiflex IIa (1955–1957) — also sold as the Tower 22 and Tower 24 M42 screw mount Cameras using the M42 lens mount, also known as the ''Pentax screw mount''. * Asahi Pentax (1957) — also sold as the Tower 26 * Asahi Pentax S (1958) — also sold as the Tower 26 * Asahi Pentax K (1958) — also sold as the Tower 29 * Asahi Pentax S2/H2 (1959) — also sold as the Honeywell Pentax H2/Honeywell Heiland Pentax H2 * Asahi Pentax S3/H3 (1960) — also sold as the Honeywell Pentax H3/Honeywell Heiland Pentax H3 * Asahi Pentax S1/H1 (1961) — also sold as the Honeywell Pentax H1/Honeywell Heiland Pentax H1 * Asahi Pentax SV/H3v (1963) — also sold as the Ho ...
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Pentax Cameras
This article discusses the cameras – mainly 35 mm SLRs – manufactured by Ricoh Imaging Corp. and its predecessors, and . Pentax must not be confused with Pentax 6x7 or Pentax 67 which are 120 medium format 6x7cm film cameras. It covers from the first "Asahiflex" models in 1952 and their successor, the pivotal "Asahi Pentax" single-lens reflex camera, last made in 1997, to the present time known as "Pentax" first made in 1981. Background The period around 1950 marked the return of the Japanese photographic industry to the vigorous level of the early 1940s, and its emergence as a major exporter. The newly reborn industry had sold many of its cameras to the occupation forces (with hugely more disposable income than the Japanese) and they were well received. The Korean War saw a huge influx of journalists and photographers to the Far East, where they were impressed by lenses from companies such as Nikon and Canon for their Leica rangefinder cameras, and also by bodies ...
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Smc Pentax-D FA 645 25mm F4 AL (IF) SDM AW
The smc Pentax-D FA 645 25mm F4 AL (IF) SDM AW is an interchangeable camera lens for the Pentax 645 medium format system. ReferencesPentax smc D FA 645 25mm F4 AL (IF) SDM AW: Digital Photography Review {{photography-stub 025 5 (five) is a number, numeral and digit. It is the natural number, and cardinal number, following 4 and preceding 6, and is a prime number. It has attained significance throughout history in part because typical humans have five digits on eac ...

Flange Focal Distance
For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus or register, depending on the usage and source) of a lens mount system is the distance from the mounting flange (the interlocking metal rings on the camera and the rear of the lens) to the film or image sensor plane. This value is different for different camera systems. The range of this distance, which will render an image clearly in focus within all focal lengths, is usually measured to a precision of hundredths of millimetres, and is not to be confused with depth of field. Lenses can be adapted from one mount (and respective FFD) to another. FFD determines whether infinity focus can be accomplished with a simple non-optical adapter. Optics to correct for distance introduce more cost and can lower image quality, so non-optical lens adapters are preferred. A simple non-optical ada ...
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Pentax 67
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 ...
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Internal Focusing
An internal focus lens (sometimes known as IF) is a photographic lens design in which focus is shifted by moving the inner lens group or groups only, without any rotation or shifting of the front lens element. This makes it easy to use, for example, a screwed-in polarizing filter or a petal shaped lens hood. During macro photography, using an internal focus lens reduces the risk of the front of the lens accidentally hitting the subject during focusing as the front element does not move. The physical size of an internal focusing lens does not change during focus, nor does the front of the lens rotate. This is particularly useful for large lenses, keeping the size more compact, or when using filters or accessories mounted on the front of the lens that may require careful alignment. One issue internal focusing lens can have is that the true focal length of the lens is reduced when not focused at infinity. See also * Breathing (lens) Breathing originally referred to any geometric chan ...
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DFB 2385
DFB may refer to: * Deerfield Beach, Florida, a city * Decafluorobutane, a fluorocarbon gas * Dem Franchize Boyz, former hip hop group, Atlanta, Georgia * Dfb, Köppen climate classification for Humid continental climate * Distributed-feedback laser, a diffraction laser system * Dublin Fire Brigade, Ireland * Dysfunctional Family BBQ, an annual K-Rockathon event * Furka Steam Railway, ''Dampfbahn Furka-Bergstrecke'', Switzerland * German Football Association The German Football Association (german: Deutscher Fußball-Bund ; DFB ) is the governing body of football in Germany. A founding member of both FIFA and UEFA, the DFB has jurisdiction for the German football league system and is in charge of t ...