exposure value

exposure value
(EV)
   a unit used in photography to describe relative exposure. EV 0 is assigned to a specific combination of exposure time and lens aperture, such as 1 second at f/1. The difference between two exposure values is equal to the number of stops separating the two exposure settings. Different combinations of exposure time and lens aperture can have the same exposure value; the unit was invented to simplify the relationship. Regardless of camera settings, EV 6 is one stop "faster" than EV 5, that is, an EV 6 setting records an image with half as much light as an EV 5 setting.

Dictionary of units of measurement. 2015.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Exposure value — In photography, exposure value (EV) denotes all combinations of camera shutter speed and relative aperture that give the same exposure. The concept was developed in Germany in the 1950s (Ray 2000),in an attempt to simplify choosing among… …   Wikipedia

  • Exposure Value — Hasselblad mit Normalobjektiv. Die rötlichen Zahlen am Objektiv sind einstellbare Lichtwerte. Hier ist LW 12 eingestellt und ergibt die Zeit Blenden Paarungen, die am Objektiv ablesbar sind …   Deutsch Wikipedia

  • Exposure value — Экспозиционное число …   Краткий толковый словарь по полиграфии

  • Exposure compensation — is a technique for adjusting the exposure indicated by a photographic exposure meter, in consideration of factors that may cause the indicated exposure to result in aless than optimal image. Factors considered may include unusual lighting… …   Wikipedia

  • Exposure — can refer toIn biology: * A condition of very poor health or death resulting from lack of protection over prolonged periods under weather, extreme temperatures or dangerous substances ( see also: hypothermia, hyperthermia, radioactive… …   Wikipedia

  • Exposure (photography) — Underexposure redirects here. For the 2005 film by Oday Rasheed, see Underexposure (2005 film). A long exposure showing stars rotating around the southern and northern celestial poles. Credit: European Southern Observatory …   Wikipedia

  • Exposure action value — An Exposure Action Value (EAV) or Action Value (AV) is a limit set on occupational exposure to noise where beyond those values, employers must take steps to monitor the exposure levels. These levels are measured in decibels. The American… …   Wikipedia

  • Exposure at default (EAD) — is a parameter used in the calculation of economic capital or regulatory capital under Basel II for a banking institution. This is an attribute of any exposure on bank s client.DefinitionIn general EAD can be seen as an estimation of the extent… …   Wikipedia

  • exposure — ex·po·sure n 1: the fact or condition of being exposed; also: the possibility of loss caused by an outside source used in insurance 2: the act or an instance of exposing 3: something that exposes someone or something; esp: something (as a… …   Law dictionary

  • Value-in-use — is the net present value (NPV) of a cash flow or other benefits that an asset generates for a specific owner under a specific use. In the U.S., Value in Use is generally estimated at a use which is less than highest and best use, and therefore… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”