Ai Servo Af For Moving Subjects - Canon MARK II EOS 5D Instruction Manual

One-Shot AF for Still Subjects
AF point Focus confirmation
In the d/s/f/a/F shooting modes, AF is also possible by
pressing the <p> button.
If focus cannot be achieved, the focus confirmation light <o> 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.84).
If the [1 Beep] menu is set to [Off], the beeper will not sound when
focus is achieved.

AI Servo AF for Moving Subjects

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 flash in red,
and the focus confirmation light <o>
in the viewfinder will also light.
With evaluative metering, the
light
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.
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 <p> button.
f: Selecting the AF ModeN
79