Canon EOS 70D Operation Manual - Page 213

Using Wireless FlashN Setting the Flash Output Manually for Wireless Flash Shooting When [Flash mode] is set to [Manual flash], flash exposure can be set manually. The flash output settings that can be set ([1 flash output], [Group A output], etc.) will differ depending on the [Wireless func.] setting (see below). Wireless func.: 0 Firing group: 1All The manual flash output setting will be applied to all the external Speedlites. Firing group: 1(A:B) You can divide the slave units into Groups A and B and set the flash output separately for each group. Wireless func.: 0+3 Firing group: 1All and 2 You can set the flash output separately for the external Speedlite(s) and built-in flash. Firing group: 1(A:B)2 You can divide the slave units into Groups A and B and set the flash output separately for each group. You can also set the flash output for the built-in flash. 213