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

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3
 Customizing AF FunctionsN
150
You can set whether the AF points in the viewfinder are to light up in red 
when focus is achieved.
AUTO: Auto
The AF points achieving focus in low 
light or with a dark subject will 
automatically light up in red.
ON: Enable
The AF points light up in red 
regardless of the ambient light level.
OFF: Disable
The AF points do not light up in red.
With [Auto] or [Enable] set, you can set whether the AF point is to light 
up in red when you press the <Q> button during AI Servo AF. 
OFF: Non illuminated
The AF points will not light up during 
AI Servo AF.
ON: Illuminated
The AF points used for focusing light 
up in red during AI Servo AF. The AF 
points also light up during continuous 
shooting.
This function will not work if [VF 
display illumination
] is set to 
[Disable].
VF display illumination
AF5
 
When you press the <S> button, the AF points will light up in red 
regardless of this setting.
 
The electronic level and grid in the viewfinder and the information set 
with [Show/hide in viewfinder] (p.84) will also light up in red.