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What shutter speed setting allows the photographer to keep the shutter open indefinaltely?
Wiki User
∙ 14y ago
Hello, not all cameras have this setting, but on SLR's the setting is called "BULB". This refers to the old cable release device which had an air filled plastic bulb on one end. When the bulb was pressed and held down, a little cable rod pushed down on the shutter release button. As long as you held the bulb, the shutter would stay open. The bulb was on a cable because the alternative was to press the shutter button with your finger, which might shake the camera and give you a blurred image.
On modern cameras, you can probably use the bulb function in conjunction with the self-timer. Set your camera to bulb, turn the self timer on and press the shutter button. Your hands will be well away from the camera when the shutter opens, then just quickly press the shutter button again or turn off the bulb function when you have achieved your desired exposure.
In film SLR's you have to watch out for fogging in the frame and the other frames immediately before and after with really long exposures, because light has a way of creeping around inside the camera if the shutter is left open too long. Use small apertures.
Hope that's helpful.
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∙ 14y ago
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