luminance meter
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Luminance — is a photometric measure of the density of luminous intensity in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. The SI unit for luminance is… … Wikipedia
luminance — The brightness of an object, expressed as the luminous flux per unit solid angle per unit projected area, measured in lamberts or in candelas per square meter. [L. lumino, to light up, fr. lumen, light] * * … Medical dictionary
luminance — The luminous intensity of a surface in a given direction per uatt of projected area of the surface, in candela per square meter; not the same as the apparent brightness … Dictionary of automotive terms
Light meter — A light meter is a device used to measure the amount of light. In photography, a light meter is often used to determine the proper exposure for a photograph. Typically a light meter will include a computer, either digital or analogue, which… … Wikipedia
Stilb (luminance) — The stilb (sb) is the CGS unit of luminance. It is equal to one candela per square centimeter or 104 nits (candelas per square meter). The name was coined by the French physicist André Blondel around 1920. [Parry Moon. System of photometer… … Wikipedia
Zone system — The Zone System is a photographic technique for determining optimal film exposure and development, formulated by Ansel Adams and Fred Archer in 1941. The Zone System provides photographers with a systematic method of precisely defining the… … Wikipedia
APEX system — APEX stands for Additive system of Photographic EXposure, whichwas proposed in the 1960 ASA standardfor monochrome film speed, ASA PH2.5 1960,as a means of simplifying exposure computation.Exposure equationUntil the late 1960s, cameras did not… … 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
Light value — NOTOC In photography, light value has been used to refer to a ldquo;light level rdquo; for either incident or reflected light, often on a base 2 logarithmic scale.The term does not derive from a published standard, and has had severaldifferent… … Wikipedia
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
Grating — A grating is any regularly spaced collection of essentially identical, parallel, elongated elements. Gratings usually consist of a single set of elongated elements, but can consist of two sets, in which case the second set is usually… … Wikipedia
