Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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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 <0>.
X
The external Speedlite control screen 
will appear.
2
Select the desired item.
 
Select the menu option to be set, then 
press <0>.
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.
3
 Setting the Flash FunctionN
Flash Firing
E-TTL II Flash Metering