出典:Wikipedia
出典:『Wikipedia』 (2011/04/28 17:42 UTC 版)
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 analog, which allows the photographer to determine which shutter speed and f-number should be selected for an optimum exposure, given a certain lighting situation and film speed.
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a gauge
light meter utilizing photoelectrons
an instrument used to measure light, named photometer
an instrument that measures the luminous intensity of light, called a photometer
a meter
an instrument used for measuring electric power in watts