Canon EOS 5DS R Instruction Manual - Page 247

3 Setting the FlashN With an EX-series Speedlite having compatible flash function settings, you can use the camera's menu screen to set the Speedlite's functions and Custom Functions. Attach the Speedlite to the camera and turn on the Speedlite before setting the flash functions. For details on the Speedlite's functions, refer to the Speedlite's instruction manual. 1 Select [External Speedlite control]. Under the [z1] tab, select [External Speedlite control], then press . X The external Speedlite control screen will appear. 2 Select the desired item. Select the menu option to be set, then press . Flash Firing E-TTL II Metering To enable flash photography, set [Enable]. To enable only the AF-assist beam to be emitted, set [Disable]. For normal flash exposures, set it to [Evaluative]. If [Average] is set, the flash exposure will be averaged for the entire metered scene. Depending on the scene, flash exposure compensation may be necessary. This setting is for advanced users. 247