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David Busch’s Canon® EOS M Guide to Digital Photography by Lee Sheldon

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Choosing Your Electronic Flash

Canon offers a broad range of accessory electronic flash units for the EOS M. They can be mounted to the flash accessory shoe, or used off-camera with a dedicated cord that plugs into the flash shoe to maintain full communications with the camera for all special features. (Non-dedicated flash units, such as studio flash, can be connected using a PC terminal adapter mounted in the accessory shoe.) They range from the Speedlite 600EX-RT and Speedlite 580EX II, which can correctly expose subjects up to 24 feet away at f/11 and ISO 200, to the 270EX, which is good out to 9 feet at f/11 and ISO 200, and the 90EX, which is, at best, a flash to be used at close distances. (You’ll get greater ranges at even higher ISO settings, ...

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