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Bulb (photography)
open-in-new
<p>The Bulb setting (abbreviated B) on camera <a href="/facts/Shutter_(photography)/83Y5rsB0">shutters</a> is a momentary-action <a href="/facts/Digital_camera_modes/ba1pVeyQ">mode</a> that holds shutters open for as <a href="/facts/Long-exposure_photography/MhHMPIoW">long</a> as a photographer depresses the shutter-release button. The Bulb setting is distinct from shutter's Time (T) setting, which is an alternate-action mode where the shutter opens when the shutter-release button is pressed and released once, and closes when the button is actuated again. </p>