Canon EOS 7D Mark II Basic Instruction Manual page 75

One-Shot AF for Still Subjects
AF point
Focus indicator
While you hold down the shutter button halfway, the focus will be
locked. You can then recompose the shot if desired.
f: Selecting the AF OperationN
Suited for still subjects. When you
press the shutter button halfway, the
camera will focus only once.
When focus is achieved, the AF point
that achieved focus will be displayed,
and the focus indicator <o> in the
viewfinder will also light up.
With evaluative metering (p.121), the
exposure setting will be set at the
same time as focus is achieved.
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