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

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Using an EX-series Speedlite (sold separately) makes flash 
photography easy.
For detailed instructions, refer to the EX-series Speedlite’s 
Instruction Manual. 
This camera is a Type-A camera that can use all 
the features of EX-series Speedlites.
To set the flash functions and flash Custom Functions on the camera’s 
menu screen, see pages 289-295.
 
Flash exposure compensation
In the same way as normal exposure compensation, flash output 
can be adjusted. You can set flash exposure compensation up to ±3 
stops in 1/3-stop increments.
Press the camera’s <m> button, then turn the <5> dial while 
looking in the viewfinder or at the LCD panel.
 
FE lock
This enables you to attain an appropriate flash exposure for a 
specific part of the subject. Aim the viewfinder center over the 
subject, press the camera’s <B> button, then compose the shot 
and take the picture.
D
 Flash Photography
EOS-dedicated, EX-series Speedlites
Macro Lites
Shoe-mount Speedlites