Selecting Wireless Functions

The Wireless settings entry has four additional options: Channel, Firing group, A:B firing 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.