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 photograph. Exposure is measured in lux seconds, and can be computed from exposure value (EV) and scene luminance. Image File history File linksMetadata Download high resolution version (3456x2304, 1185 KB) Summary A demonstration of the effect of long shutter speeds. ...
Image File history File linksMetadata Download high resolution version (3456x2304, 1185 KB) Summary A demonstration of the effect of long shutter speeds. ...
Image File history File linksMetadata Download high-resolution version (3072x2048, 2323 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Exposure (photography) Twilight Metadata This file contains additional information, probably added from the digital camera or scanner used...
Image File history File linksMetadata Download high-resolution version (3072x2048, 2323 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Exposure (photography) Twilight Metadata This file contains additional information, probably added from the digital camera or scanner used...
Photography [fәtɑgrәfi:],[foʊtɑgrәfi:] is the process of recording pictures by means of capturing light on a light-sensitive medium, such as a film or sensor. ...
This article or section does not cite any references or sources. ...
This article or section does not cite its references or sources. ...
Hello--80. ...
This article or section does not adequately cite its references or sources. ...
The lux (symbol: lx) is the SI derived unit of illuminance or illumination. ...
Look up second in Wiktionary, the free dictionary. ...
Fast shutter speed, short exposure Slow Shutter speed, long exposure In photography, exposure value (EV) is a value given to all combinations of camera shutter speed and aperture that gives the same exposure. ...
Luminance (also called luminosity) is a photometric measure of the density of luminous intensity in a given direction. ...
Correct exposure
Long exposure with soft red light The "correct" exposure for a photograph is determined by the sensitivity of the medium used. For photographic film, sensitivity is referred to as film speed and is measured on a scale published by the International Organization for Standardization (ISO). Faster film requires less exposure and has a higher ISO rating. Exposure is a combination of the length of time and the level of illumination received by the photosensitive material. Exposure time is controlled in a camera by shutter speed and the illumination level by the lens aperture. Slower (longer) shutter speeds and greater (bigger) lens apertures produce greater exposures. The electronics in a digital camera may allow one to adjust the sensitivity of the CCD or CMOS sensor. ISO numbers are usually used to express this attribute. Image File history File linksMetadata Download high-resolution version (1024x1536, 194 KB)photograph taken by User:W.M.DeJardine, http://www. ...
Image File history File linksMetadata Download high-resolution version (1024x1536, 194 KB)photograph taken by User:W.M.DeJardine, http://www. ...
Film speed is the measure of a photographic films sensitivity to light. ...
This article or section does not cite any references or sources. ...
Large format camera lens. ...
The shutter speed dial of a Fujica STX-1. ...
a big (1) and a small (2) aperture For other uses, see Aperture (disambiguation). ...
This article or section does not cite any references or sources. ...
An approximately correct exposure will be obtained on a sunny day using ISO 100 film, an aperture of f/16 and a shutter speed of 1/125th of a second. This is called the sunny 16 rule: at an aperture of f/16 on a sunny day, a suitable shutter speed will be one over the film speed (or closest equivalent). A 35mm lens set to f/11, as indicated by the white dot above the f-stop scale on the aperture ring In photography the f-number (focal ratio) expresses the diameter of the diaphragm aperture in terms of the effective focal length of the lens. ...
In photography, the sunny f/16 rule is a method to obtain correct exposure without using a light meter. ...
Ultimately there is no such thing as "correct exposure", as a scene can be exposed in many ways, depending on the desired effect a photographer wishes to convey.
Reciprocity An important principle of exposure is reciprocity. If one exposes the film or sensor for a longer period, a reciprocally smaller aperture is required to reduce the amount of light hitting the film to obtain the same exposure. For example, the photographer may prefer to make his sunny-16 shot at an aperture of f/5.6 (to obtain a shallow depth of field). As f/5.6 is 3 stops 'faster' than f/16, with each stop meaning double the amount of light, a new shutter speed of (1/125)/(2·2·2) = 1/1000 is needed. Once the photographer has determined the exposure, aperture stops can be traded for halvings or doublings of speed, within limits.
In photography, reciprocity refers to the relationship between different choices of aperture and shutter speed that result in identical exposure. ...
 A demonstration of the effect of exposure in night photography. Longer shutter speeds mean increased exposure. The true characteristic of most photographic emulsions is not actually linear, (see sensitometry) but it is close enough over the exposure range of about one second to 1/1000th of a second. Outside of this range, it becomes necessary to increase the exposure from the calculated value to account for this characteristic of the emulsion. This characteristic is known as reciprocity failure. The film manufacturer's data sheets should be consulted to arrive at the correction required as different emulsions have different characteristics. Image File history File links Download high resolution version (4590x653, 502 KB) File links The following pages link to this file: Exposure (photography) Image:Shutter speed in Greenwich. ...
Image File history File links Download high resolution version (4590x653, 502 KB) File links The following pages link to this file: Exposure (photography) Image:Shutter speed in Greenwich. ...
Sensitometry is the scientific study of light-sensitive materials, especially photographic film. ...
In photography, reciprocity refers to the relationship between different choices of aperture and shutter speed that result in identical exposure. ...
Digital camera image sensors can also be subject to a form of reciprocity failure.[1] This article or section does not cite any references or sources. ...
Hello--80. ...
Determining exposure
 Long exposures can create very interesting photos. The zone system is another method of determining exposure and development combinations to achieve a greater tonality range over conventional methods by varying the contrast of the 'film' to fit the print contrast capability. Digital cameras can achieve similar results (high dynamic range) by combining several different exposures (varying only the shutter speeds) made in quick succession. Image File history File linksMetadata Download high-resolution version (1600x1064, 1325 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Exposure (photography) Motion blur Fair User:Gphoto/Gallery Wikipedia:Featured picture candidates/Fair ride Wikipedia:Featured picture candidates...
Image File history File linksMetadata Download high-resolution version (1600x1064, 1325 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Exposure (photography) Motion blur Fair User:Gphoto/Gallery Wikipedia:Featured picture candidates/Fair ride Wikipedia:Featured picture candidates...
This article or section may be excessively or inappropriately using first or second person, contrary to the formal tone expected of an encyclopedia entry. ...
An example of a rendering of an HDRI image into an 8-bit JPEG. This image is of the Tower Bridge in Sacramento, California. ...
Today, most cameras automatically determine the correct exposure at the time of taking a photograph by using a built-in light meter, or multiple point meters interpreted by a built-in computer, see metering mode. A light meter is a device used to measure the amount of light. ...
In photography, the metering mode refers to the way in which a camera determines the correct exposure. ...
Negative/Print film tends to bias for exposing for the shadow areas (film dislikes being starved of light), with digital favouring exposure for highlights. See latitude below.
Latitude Latitude is the degree by which you can over, or under expose an image, and still recover an acceptable level of quality from an exposure. Typically negative film has a better ability to record a range of brightness than slide/transparency film or digital. Digital should be considered to be the reverse of print film, with a good latitude in the shadow range, and a narrow one in the highlight area; in contrast to film's large highlight latitude, and narrow shadow latitude. Slide/Transparency film has a narrow latitude in both highlight and shadow areas, requiring greater exposure accuracy.
Negative film's latitude increases somewhat with high ISO material, in contrast digital tends to narrow on latitude with high ISO settings.
Highlights -
 Example image exhibiting blown-out highlights. Top: original image, bottom: blown-out areas marked red Areas of a photo where information is lost due to extreme brightness are described as having "blown-out highlights" or "flared highlights". Clipping is when a part of a photograph is brighter than what the imaging device can handle. ...
Image File history File linksMetadata Download high-resolution version (1300x1950, 1439 KB) Example image showing blown-out highlights due to insufficient dynamic range of the digital camera. ...
Image File history File linksMetadata Download high-resolution version (1300x1950, 1439 KB) Example image showing blown-out highlights due to insufficient dynamic range of the digital camera. ...
In digital images this information loss is often irreversible, though small problems can be made less noticeable using photo manipulation software. Recording to RAW format can ameliorate this problem to some degree, as can using a digital camera with a better sensor. A graphics program is a piece of computer software that enables a user to modify or view graphics files. ...
Film can often have areas of extreme overexposure but still record detail in those areas. This information is usually somewhat recoverable when printing or transferring to digital.
A loss of highlights in a photograph is usually undesirable, but in some cases can be considered to "enhance" appeal. Examples include black-and-white photography and portraits with an out-of-focus background.
Blacks Areas of a photo where information is lost due to extreme darkness are described as "crushed blacks". Digital capture tends to be more tolerant of underexposure, allowing better recovery of shadow detail, than same-ISO negative print film.
Crushed blacks cause loss of detail, but can be used for artistic effect.
See also In film and photography, double exposure is a technique in which a piece of film is exposed twice, to two different images. ...
Fast shutter speed, short exposure Slow Shutter speed, long exposure In photography, exposure value (EV) is a value given to all combinations of camera shutter speed and aperture that gives the same exposure. ...
Gray cards are used, together with reflective light meters, as a way to produce consistent images in film and photography. ...
In photography, light value has been used to refer to luminance (brightness), often on a base-2 logarithmic scale. ...
Sensitometry is the scientific study of light-sensitive materials, especially photographic film. ...
External links - digital Exposure Correction with Gimp
- Articles on Exposure
- Video Tutorial on how to read the photographic histogram and get proper exposure
| 
Feeds |
Contact