Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 89)

89
f : Selecting the AF Operation
Suited for still subjects. When you
press the shutter button halfway, the
camera will focus only once.
The AF point which achieves focus
flashes in red, and the focus indicator
<
o > in the viewfinder will also light
up.
With evaluative metering (p.238), the
exposure setting will be set at the
same time as focus is achieved.
While you hold down the shutter
button halfway, the focus will be
locked. You can then recompose the
shot if desired.
One-Shot AF for Still Subjects
Focus
indicator
AF point
If focus cannot be achieved, the focus indicator < o > in the viewfinder
will blink. If this occurs, the picture cannot be taken even if the shutter
button is pressed completely. Recompose the shot and try to focus again
or see “When Autofocus Fails” (p.144).
If [ z 3: Beep ] is set to [ Disable ], the beeper will not sound when focus
is achieved.
After achieving focus with One-Shot AF, you can lock the focus on a
subject and recompose the shot. This is called “focus lock”. This is useful
when you want to focus on a peripheral subject not covered by the Area
AF frame.
When a lens equipped with electronic manual focusing function is used,
after achieving focus, you can focus manually by turning the lens
focusing ring while pressing the shutter button halfway.