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It means "bulb", and is a shutter speed setting that will allow you to keep open the shutter by depressing the release and holding it down. In actual fact, it would be pointless in most cases to do this using your finger on the release as you will cause camera shake and image blurriness. A cable release and tripod is the norm. The word bulb comes from the fact that the original releases used for this were made from tubing to transmit air pressure caused by squeezing a rubber bulb for as long as you wanted the shutter to remain open. I believe these pre-date the invention of wire cable that was thin and stiff enough to replace the air pressure method.

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15y ago

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