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Old Nov 20, 2006, 3:57 PM   #1
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:?When increased exposure is used where does the more brightness come from and with also with a external flash. by doing this does eat more juice from the batteries?:?
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Old Nov 21, 2006, 7:57 AM   #2
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The increase brightness comes from slower shutter speed and or larger aperture...

Ditto with external flash, the increase exposure could also come from shutter/aperture alone or from the flash depending on how you biais the two (as a fill or as a full-flash)
-> If the increase brightness come mainly from the flash then the flash's battery will be used (if it's the built-in flash then the camera's battery will provide more juice)
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Old Nov 22, 2006, 11:49 AM   #3
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For electronic flash and shutter speeds slower than about 1/250'th second, only the aperture governs the exposure. The flash itself is short enough that increasing the shutter speed will not increase the exposure afforded by the flash.

Some flash units have a sensor that picks up the overall scene lighting including the light from the flash, and that makes the flash shorter in durationto avoid overexposure.

Occasionally, even with flash, the shutter speed is slow enough and there is enough exisiting light in the room that camera movement blur can still be noticed.

An external flash usually has its own battery.

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