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Photoflood lamps are a type of incandescent light bulb designed for use as a continuous light source for photographic lighting. [1] The filaments of such lamps are operated at much higher temperatures than is the case for standard, general lighting service lamps.
The foot-candle is defined as one lumen per square foot. This unit is commonly used in lighting layouts in parts of the world where United States customary units are used, mainly the United States. [1] Nearly all of the world uses the corresponding SI derived unit lux, defined as one lumen per square meter.
At the maximum (standard) D850 X-sync shutter speed of 1 ⁄ 250 s, the exposure time is 1 ⁄ 250 s = 4.0 ms, so about 4.0 ms − 2.4 ms = 1.6 ms are available to trigger and fire the flash, and with a 1 ms flash duration, 1.6 ms − 1.0 ms = 0.6 ms are available to trigger the flash in this Nikon D850 example.
Starlight overcast moonless night sky [1] 140 microlux: Venus at brightest [1] 200 microlux: Starlight clear moonless night sky excluding airglow [1] 10 −3: 1 millilux: 2 millilux: Starlight clear moonless night sky including airglow [1] 10 −2: 1 centilux: 1 centilux: Quarter Moon 10 −1: 1 decilux: 2.5 decilux: Full Moon on a clear night ...
However, people still sometimes use it to describe the luminous intensity of high powered flashlights and spotlights. Narrow-beamed lights of all sorts can have very high candlepower specifications, because candlepower measures the intensity of the light on a target, rather than the total amount of light it emits.
Thus, a camera with a fastest shutter speed of 1 / 400 th of a second (one that began exposures 18.75 ms after a bulb was fired with M sync triggering), and which was set to 1 / 25 th of a second, would close its shutter 59 ms after triggering a flashbulb (18.75 ms + 40 ms = 58.75 ms) and would achieve the maximum rated guide number from the No ...
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