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

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3
 Menu Function Settings
386
 
V
 button function
You can set the functions performed by 
pressing the shutter button halfway or 
completely during movie shooting.
If [
/k] or [q/k] is set, besides pressing the <0> button, 
you can start or stop the movie shooting by pressing the shutter 
button completely or by using Remote Switch RS-80N3 or Timer 
Remote Controller TC-80N3 (each sold separately, p.279).
 
Time-lapse movie
You can shoot time-lapse movies. For details, see page 371.
Setting
Pressing halfway
Pressing completely
/–
Metering and AF
No function
q
/–
Metering only
No function
/k
Metering and AF
Starts/stops movie 
shooting
q
/k
Metering only
Starts/stops movie 
shooting
 
Even if you set [z5: V btn function] to [q/-] or [q/k], AF will work 
in time-lapse movie shooting by pressing the shutter button halfway.
 
During movie shooting, the [z5: V btn function] setting overrides any 
function assigned to the shutter button with [83: Custom Controls].