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Chapter 11. Using the Canon EOS 5D Mark ... > Selecting Wireless Functions - Pg. 338

338 David Busch's Canon EOS 5D Mark II Guide to Digital SLR Photography Selecting Wireless Functions The Wireless settings entry has four additional options: Channel, Firing group, A:B fir- ing ratio, and Group C exposure compensation. I'll explain each of these in turn. Choosing a Channel Canon's wireless flash system can work on any of four channels, so if more than one photographer is using the Canon system, each can set his gear to a different channel so they don't accidentally trigger each other's strobes. You need to be sure all of your gear is set to the same channel. The ability to operate flash units on one of four channels isn't really important unless you're shooting in an environment where other photographers are also using the Canon wireless flash system. If the system only offered one channel, then each photographer's wireless flash controller would be firing every Canon flash set for wireless operation. By having four channels available, the photographers can coordinate their use to avoid that problem. Such situations are common at sporting events and other activities that draw a lot of shooters. It's always a good idea to double-check your flash units before you set them up to make