 Running water "frozen" by flash. In photography, a flash is a device that produces an instantaneous flash of artificial light (typically around 1/3000 of a second) at a color temperature of about 5500K to help illuminate a scene. While flashes can be used for a variety of reasons (e.g. capturing quickly moving objects, creating a different temperature light than the ambient light) they are mostly used to illuminate scenes that do not have enough available light to adequately expose the photograph. The term flash can either refer to the flash of light itself, or as a colloquialism for the electronic flash unit which discharges the flash of light. The vast majority of flash units today are electronic, having evolved from single-use flash-bulbs and flammable powders. Image File history File links Flash_photo_shower_faucet_Watr200. ...
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Image File history File links Download high-resolution version (1000x810, 504 KB) If used outside Wikipedia, must be accompanied by credit: By Wikipedia editor J-E Nyström (User:Janke), Finland File links The following pages on the English Wikipedia link to this file (pages on other projects are not...
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Binomial name Macroglossum stellatarum Linnaeus, 1758 The Hummingbird Hawk-moth (Macroglossum stellatarum) is a species of hawk moth with a long proboscis, and is capable of hovering in place, making an audible humming noise. ...
This diagram shows how the law works. ...
Image File history File links Download high resolution version (1067x1600, 91 KB) Canon Speedlite 430EX File links The following pages link to this file: Flash (photography) List of Canon products Canon EOS flash system ...
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Photography [fәtɑgrәfi:],[foʊtɑgrәfi:] is the process of recording pictures by means of capturing light on a light-sensitive medium, such as a film or electronic sensor. ...
Not to be confused with lightning. ...
This article does not cite any references or sources. ...
Color temperature is a characteristic of visible light that has important applications in photography, videography, publishing and other fields. ...
A photograph with an exposure time of 25 seconds A photograph of a night-time sky with an exposure time of 8 seconds In photography, exposure is the total amount of light allowed to fall on the photographic medium (photographic film or image sensor) during the process of taking a...
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Look up Colloquialism in Wiktionary, the free dictionary. ...
In lower-end consumer photography, flash units are commonly built directly into the camera, while higher-end cameras allow separate flash units to be mounted via a standardized accessory mount bracket. In professional studio photography, flashes often take the form of large, standalone units, or studio strobes, that are powered by special battery packs and synchronized with the camera from either a flash synchronization cable, radio transmitter, or are light-triggered, meaning that only one flash unit needs to be synchronized with the camera, which in turn triggers the other units. In a camera, flash synchronization is required for the firing of a photographic flash to coincide with the shutter admitting light to the photographic film. ...
Types of flashes
Flash bulbs The earliest flashes consisted of a quantity of magnesium flash powder that was ignited by hand. Later, magnesium filaments were contained in flash bulbs, and electrically ignited by a contact in the camera shutter; such a bulb could only be used once, and was too hot to handle immediately after use, but the confinement of what would otherwise have amounted to a small explosion was an important advance. A later innovation was coating flashbulbs with a plastic coating to improve spectral quality as well as providing protection from the rare occasion when a flashbulb would crack during a flash. General Name, symbol, number magnesium, Mg, 12 Chemical series alkaline earth metals Group, period, block 2, 3, s Appearance silvery white solid at room temp Standard atomic weight 24. ...
Flash powder is a mixture of oxidizer and metallic fuel which burns quickly and if confined will produce a loud report. ...
This article is about the photographing device. ...
It has been suggested that Leaf shutter be merged into this article or section. ...
Flashbulbs took longer to achieve full brightness and burned for a longer duration than electronic flashes, and slower shutter speeds (typically from 1/10 to 1/50 of a second) were used on cameras to ensure proper synchronization. One of the most widely used flash bulbs up through the 1960s was the number 25. This is the large (approximately 1 inch (25mm) in diameter) flash bulb often shown used by newspapermen in period movies, usually attached to a press camera or a twin-lens reflex camera. A press camera is a large format camera suited to the press photographer need. ...
The front of a Kinaflex twin-lens reflex camera Sketch of an early 20th century twin-lens reflex camera 1957 Kodak Duaflex IV, an inexpensive fixed-focus TLR A twin-lens reflex camera (TLR) is a type of camera with two objective lenses of the same focal length. ...
Flashcubes, Magicubes and Flipflash In the late 1960s, Kodak improved their Instamatic camera line by replacing the individual flashbulb technology (used on early Instamatics) with the Flashcube. Flashcubes consisted of four electrically fired flashbulbs with an integral reflector in a cube-shaped arrangement that allowed taking four images in a row. The flashcube automatically rotated 90 degrees to a fresh bulb upon advancing the film to the next exposure. Eastman Kodak Company (NYSE: EK) is a large multinational public company producing photographic equipment. ...
The Kodak Instamatic series of inexpensive, easy to load cameras was introduced in 1963, and featured an easy load film cartridge. ...
The later Magicube retained the four-bulb format, and was superficially similar to the original Flashcube. However, in the Magicube each bulb was set off by a plastic pin in the cube mount that released a cocked spring wire within the cube. This wire, in turn, struck a primer tube, at the base of the bulb, which contained a fulminating material. The fulminate ignited shredded zirconium foil in the flash and, thus, a battery was not required. Magicubes could also be set off by inserting a thin object, such as a key or paper clip, into one of the slots in the bottom of the cube. Symbols representing a single Cell (top) and Battery (bottom), used in circuit diagrams. ...
Another common flashbulb-based device was the Flipflash which included ten or so bulbs in a single unit. The name derived from the fact that once half the flashes had been used up, the unit had to be flipped and re-inserted to use the remainder.
Modern flash technology Today's flash units are often electronic xenon flash lamps. An electronic flash contains a tube filled with xenon gas, where electricity of high voltage is discharged to generate an electrical arc that emits a short flash of light. (A typical duration of the light impulse is 1/1000 second.) As of 2003, the majority of cameras targeted for consumer use have an electronic flash unit built in. 2007 is a common year starting on Monday of the Gregorian calendar. ...
This article is about the engineering discipline. ...
Xenon flash lamp being fired. ...
General Name, Symbol, Number xenon, Xe, 54 Chemical series noble gases Group, Period, Block 18, 5, p Appearance colorless Standard atomic weight 131. ...
A 3000 volt electricity arc between two nails Electricity arcs between the power rail and electrical pickup shoe on a London Underground train An electric arc can melt calcium oxide An electric arc is an electrical breakdown of a gas which produces an ongoing plasma discharge, resulting from a current...
2003 is a common year starting on Wednesday of the Gregorian calendar, and also: The International Year of Freshwater The European Disability Year Events January events January 1 Luíz Inácio Lula Da Silva becomes the 37th President of Brazil. ...
This article is about the photographing device. ...
Another type of flash unit are microflashes, which are special, high-voltage flash units designed to discharge a flash of light with an exceptionally quick, sub-microsecond duration. These are commonly used by scientists or engineers for examining extremely fast moving objects or reactions, famous for producing images of bullets tearing through objects like lightbulbs or balloons (see Harold Eugene Edgerton). To help compare orders of magnitude of different times this page lists times between 10−6 seconds and 10−5 seconds (1. ...
This article is about firearms projectiles. ...
Shadowgraph of a . ...
Studio flashes usually contain a modeling light, which is an incandescent light bulb placed close to the flash tube. The continuous illumination of a modeling light helps in visualizing the effect of the flash. Light bulb redirects here. ...
Technique A flash is commonly used indoors as the main light source, because there is not enough other light for a desired shutter speed. A fill flash is a low powered flash mixed with ambient light, and is often used to illuminate shadows on the side of a subject facing the camera. Another technique, bouncing a flash, involves pointing a flash upwards off of a surface, often a white celling, where it is reflected back onto the subject. Bouncing creates a more natural light effect and lessens shadows and glare but requires more flash power than a direct flash.
Part of the bounced light can be also aimed directly on the subject by "bounce cards" attached to the flash unit. That increases the efficiency of the flash and compensates shadows caused by light coming from the ceiling. It's also possible to use one's own palm for that purpose, resulting in warmer tones on the picture, as well as eliminating the need to carry additional accessories.
Pitfalls - A typical problem with amateur cameras is the low intensity of the flash, as the light will often not suffice for good pictures at distances of over 3 meters (10 ft.) or so. Dark, murky pictures with excessive image noise or "grain" will result. In order to get good flash pictures with simple cameras, it is important not to exceed the recommended distance for flash pictures.
- The "Red-eye effect" is another problem - since the retina of the human eye reflects red light straight back in the direction it came from, pictures taken from straight in front of a face often exhibit this effect. It can be somewhat reduced by using the "red eye reduction" found on many cameras (a pre-flash that makes the subject's irises contract). However, really good results can be obtained only with a flash unit that is separated from the camera, sufficiently far from the optical axis, or by using bounce flash, where the flash head is angled to bounce light off a wall, ceiling or reflector.
Image noise is unwanted and manifested in the pixels of an image. ...
The red-eye effect The red-eye effect is seen in animals as well. ...
Human eye cross-sectional view. ...
For other uses, see Eye (disambiguation). ...
In anatomy, the iris (plural irises or irides) is the most visible part of the eye of vertebrates, including humans. ...
In telecommunication, the term optical axis has the following meanings: 1. ...
See also // List of camera manufacturers Alpa ARCA Swiss Cambo Canham Canon Contax Cosina Ebony (camera maker) Fotoman Fujifilm Gandolfi Gowland Graflex Hasselblad Holga Horseman Kiev-Arsenal (photo camera) Kodak Konica Minolta Kyocera Leica Leningradskoye Optiko Mechanichesckoye Obyedinenie(LOMO) Linhof Littman Mamiya Minox Nikon Olympus Panasonic Pentacon (Praktica) Pentax Polaroid Ricoh Rollei...
This diagram shows how the law works. ...
A ring flash is a type of circular photographic flash that fits around the lens, especially for use in macro (or close-up) photography. ...
BC Flash - Battery-Capacitor Flash. ...
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