Canon EOS 7D - Manual (Page 89)

89
f : Selecting the AF ModeN
Suited for still subjects. When you
press the shutter button halfway, the
camera will focus only once.
When focus is achieved, the AF point
which achieved focus will be
displayed, and the focus confirmation
light in the viewfinder will also
light.
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.
In the d/s/f/a/F shooting modes, AF is also possible by
pressing the
button.
This AF mode is for moving subjects when the focusing distance
keeps changing. While you hold down the shutter button halfway,
the subject will be focused continuously.
The exposure is set at the moment the picture is taken.
In the d/s/f/a/F shooting modes, AF is also possible by
pressing the
button.
One-Shot AF for Still Subjects
Focus confirmation light
AF point
AI Servo AF for Moving Subjects
If focus cannot be achieved, the focus confirmation light in the
viewfinder will blink. If this occurs, a picture cannot be taken even if the
shutter button is pressed completely. Recompose the picture and try to
focus again. Or see “When Autofocus Fails” (p.96).
If the [1 Beep] menu is set to [Off], the beeper will not sound when
focus is achieved.
With AI Servo AF, the beeper will not sound even when focus is achieved.
Also, the focus confirmation light in the viewfinder will not light.