Canon EOS 7D Mark II Instruction Manual page 273

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*1: If the Speedlite does not have a transmission channel setting function, it

operates regardless of the channel set on the camera.

*2: In small rooms, the slave unit may work even if its wireless sensor does not

face the camera. The camera's wireless signals can bounce off the walls and

be received by the slave unit. When using an EX-series Speedlite with fixed

flash head and wireless sensor, make sure it fires when you take pictures.

Canceling the slave unit's auto power off

To cancel the slave unit's auto power off, press the camera's

The camera's master unit function cannot be used for wireless flash

shooting with radio transmission.

Using Wireless FlashN