Canon EOS 6D Mark II, Instruction Manual

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3
Custom Function Settings
N
C.Fn II-4 AI Servo 1st image priority
You can set the AF operation
characteristics and shutter-release timing
for the first shot with AI Servo AF.
Equal priority
Equal priority is given to focusing and shutter release.
:
Release priority
Pressing the shutter button takes the picture immediately even if
focus has not been achieved. Useful when you want to give priority
to capturing the decisive moment rather than achieving focus.
: Focus priority
Pressing the shutter button does not take the picture until focus is
achieved. Useful when you want to achieve focus before capturing
the image.