Bulb (photography)
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(Redirected from Cable release)
Bulb is a shutter-speed setting on an adjustable camera that allows for long exposures under user control. When set on “B”, the shutter will stay open as long as the shutter release button remains depressed. The “T”, or Time, setting, on the other hand, requires one press to open the shutter and a second press to close it.
more at http://en.wikipedia.org/wiki/Cable_release
