Canon EOS 80D - Manual (Page 113)

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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 in the
viewfinder will also light up.
 With evaluative metering, the
exposure setting will be set at the
same time 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 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.
 If [z1: 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.