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 <o> 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 <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.
 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.