Canon EOS Rebel T6i Video Creator Kit Instruction Manual - Page 190

Custom Wireless Flash ShootingK 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.) vary depending on the [Wireless func.] setting (see below). [Wireless func.0]  [Firing group: 1All]: The manual flash output setting is applied to all the external Speedlites.  [Firing group: 1 (A:B)]: You can set the flash output separately for slave groups A and B. [Wireless func.0+3]  [Firing group: 1All and 2]: The flash output can be set separately for the external Speedlite(s) and built-in flash.  [Firing group: 1 (A:B)2]: You can set the flash output separately for slave groups A and B. You can also set the flash output for the built-in flash. 190