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Use of a light meter for portrait cinematography in a Turkish music video set. A light meter (or illuminometer) is a device used to measure the amount of light.In photography, an exposure meter is a light meter coupled to either a digital or analog calculator which displays the correct shutter speed and f-number for optimum exposure, given a certain lighting situation and film speed.
The actual metering itself happens in two different ways, depending on the medium. Digital TTL works differently than analog TTL. The analog version of TTL works as follows: when the incoming light hits the film, a part of it is reflected towards a sensor. This sensor controls the flash. If enough light is captured, the flash is stopped. [2]
In this system, the meter concentrates on the central 60–80% of the scene. The balance is then "feathered" out towards the edges.This mode of exposure is less influenced by peripheral areas of the scene and is therefore well suited for photographs with subjects or objects of interest in the central part of the image.
Analog electronic photography was sometimes used in the late 20th century but soon died out. Photographic films utilize silver halide crystals suspended in emulsion , which when exposed to light record a latent image , which is then processed making it visible and insensitive to light.
An exposure meter may not always be available, and using a meter to determine exposure for some scenes with unusual lighting distribution may be difficult. [4] However, natural light, as well as many scenes with artificial lighting, is predictable, so that exposure often can be determined with reasonable accuracy from tabulated values.
An incident-light meter measures the true luminous exposure (in lux⋅seconds) arriving at a scene. The magnitude of guide numbers is a function of the following four variables: The total luminous energy (in lumen⋅seconds) emitted by the flash head (which is itself the product of the duration and the average luminous flux of a flash).
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