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David Busch’s Compact Field Guide for the Canon® EOS® 5D Mark III by David D. Busch

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Chapter 5Using an External Flash

Your 5D Mark III has no built-in flash, but you can use an external flash (or “strobe” or “Speedlite”), either mounted on the 5D Mark III’s accessory shoe or used off-camera and linked with a cable to the hot shoe, or, if the flash is a non-dedicated unit, to the camera’s PC terminal, or triggered by a slave light (which sets off a flash when it senses the firing of another unit). Consider using electronic flash:

images When you need extra light. Flash provides extra illumination in dark environments where existing light isn’t enough for a good exposure, or is too uneven to allow a good exposure even with the camera mounted ...

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