Canon 1D X - Manual (Page 91)

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With the [22] to [25] menu tabs, you
can set AF functions to suit your
shooting style or subject.
You can set the AF operation characteristics and shutter-release timing
for the first shot during continuous shooting 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. This gives priority to
getting the shot rather than achieving
correct focus.
: Focus priority
Pressing the shutter button does not take the picture until focus has
been achieved. Effective when you want to achieve focus before
capturing the shot.
3 Customizing AF Functions
22: AI Servo
AI Servo 1st image priority
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