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

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More Wireless Options and Capabilities

If you’re ready to immerse yourself even more deeply in wireless flash photography, the next sections will provide a little more detail on using some of the settings for ratios, channels, and groups.

Internal/External Flash Ratio Setting

Your on-camera flash and your wireless flash units have their own individual oomph—how much illumination they put out. This option lets you choose the relationship between these units, a power ratio between your on-camera flash and your wireless flash units—the relative strength of each. That ability can be especially useful if you want to use the on-camera flash for just a little fill light (it’s not very powerful, anyway), while letting your off-camera units do the heavy ...

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