 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. By definition, EV 0 corresponds to a shutter speed of 1 s and an aperture of f/1.0. It is a base 2 negative logarithmic scale, where an increase of one EV corresponds to half the amount of light admitted. Image File history File links Download high resolution version (1600x1067, 559 KB) High speed photo. ...
Image File history File links Download high resolution version (1600x1067, 559 KB) High speed photo. ...
Image File history File links Download high resolution version (1600x1067, 307 KB) Slow speed photo. ...
Image File history File links Download high resolution version (1600x1067, 307 KB) Slow speed photo. ...
Photography is the process of making pictures by means of the action of light. ...
A camera is a device used to take pictures (usually photographs), either singly or in sequence, with or without sound recording, such as with video cameras. ...
The shutter speed dial of a Fujica STX-1. ...
In optics, an aperture is something which restricts the diameter of the light path through one plane in an optical system. ...
A photograph with an exposure time of 25 seconds In photography, exposure is the total amount of light allowed to fall on the sensor (photographic film or CCD) during the process of taking a photograph. ...
Look up second in Wiktionary, the free dictionary. ...
Logarithms to various bases: is to base e, is to base 10, and is to base 1. ...
By the Additive Photographic Exposure System (APEX), the exposure value is the sum of the Aperture Value and the Time Value:
- EV = AV + TV
If N is the f-number (such as 2.8, 4.0, 5.6, ...), the Aperture Value is 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. ...
 . If t is the shutter time in seconds, the Time Value is Look up second in Wiktionary, the free dictionary. ...
 . A light meter will read the amount of light from a scene giving a light value, and this will have to be translated to an EV depending on the film speed used, usually expressed as an ISO rating. For ISO 100 film, the metered light value is identical to the exposure value required for a "proper" exposure. Slower films with ISO films speeds below 100 require a corresponding increase in exposures, i.e. lower exposure values. In practice, most light meters for photography will have a setting for film speed, and give exposure value or a list of suitable aperture/shutter combinations directly. Some cameras, like certain Hasselblad models, also have markings for EV. Photograph of a handheld digital ambient light meter, showing an f-stop of 5. ...
In photography, the term light value, usually abbreviated LV, is a value given to the amount of light coming from a scene in absolute terms, as measured by a light meter. ...
Film speed is the measure of a photographic film stocks sensitivity to light. ...
Hasselblad is a Swedish manufacturer of high-quality still photography cameras based in Gothenburg, Sweden. ...
Typical shutter/aperture combinations and corresponding exposure values for ISO 100 film are listed in the following table:
Table of exposure values (ISO 100) | f-number | | shutter (s) | 1.0 | 1.4 | 2.0 | 2.8 | 4.0 | 5.6 | 8.0 | 11 | 16 | 22 | 32 | 45 | 64 | | 60 | −6 | −5 | −4 | −3 | −2 | −1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | | 30 | −5 | −4 | −3 | −2 | −1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | | 15 | −4 | −3 | −2 | −1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | | 8 | −3 | −2 | −1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | | 4 | −2 | −1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | | 2 | −1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | | 1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | | 1/2 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | | 1/4 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | | 1/8 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | | 1/15 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | | 1/30 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | | 1/60 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | | 1/125 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | | 1/250 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | | 1/500 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | | 1/1000 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | | 1/2000 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | | 1/4000 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | | 1/8000 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 |
External links
- The Additive System for Photographic Exposure (PDF)
- LV and EV explained
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