The Bulb setting (abbreviated B) on camera shutters is a momentary-action mode that holds shutters open for as long as the 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.
The Bulb setting (abbreviated B) on camera shutters is a momentary-action mode that holds shutters open for as long as the 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.
Source: Wikipedia "Bulb (photography)" · CC BY-SA 4.0
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