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B ( Bulb) - A shutter speed dial setting that indicates that the shutter will remain open as long as the release button is depressed - also known as the "B setting " or " Bulb" setting. The "B" setting is used for time exposures.
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Usually, the slowest shutter speed that syncs with a flash unit is indicated in red or another off color or a lightning bolt symbol on the shutter speed dial.
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The faster the speed the shorter the exposure. Shutter speed settings are given in the fraction of a second. Each setting is half the duration of the preceding one in a constant scale, marked on the shutter speed dial or ring.
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See also: Shutter, Aperture, Light, Shutter speed, Speed
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