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

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Elements of Wireless Flash

Here are some of the key concepts to electronic flash and wireless flash that I’ll be describing in this chapter. Learn what these are, and you’ll have gone a long way toward understanding how to use wireless flash. You need to understand the various combinations of flashes that can be used, how they can be controlled individually and together, and why you might want to use multiple and off-camera flash units. I’m going to address all these points in this section.

Flash Combinations

Your EOS M can use a clip-on flash unit, like the 90EX, or another on-camera flash, which can be used alone, or in combination with other external flash units. Here’s a quick summary of the permutations available to you.

On-camera flash ...

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