64
The AF mode is the autofocusing operation method. Three AF modes
are provided. One-Shot AF is suited for still subjects, while AI Servo AF
is for moving subjects. And AI Focus AF switches from One-Shot AF to
AI Servo AF automatically if the still subject starts moving. In the Basic
Zone modes, the optimum AF mode is set automatically.
1
On the lens, set the focus mode
switch to <AF>.
2
Set the Mode Dial to a Creative
Zone mode.
3
Press the <
E
> button.
(
9
)
4
Select the AF mode.
¡
While looking at the LCD panel, turn
the <
6
> dial.
X
: One-Shot AF
9
: AI Focus AF
Z
: AI Servo AF
f
Selecting the AF Mode
N
If an Extender (optional) is attached and the maximum aperture of the lens
is f/5.6 or smaller, AF will not be possible. For details, see the Extender’s
instructions.
<
AF
> stands for auto focus. <
MF
> stands for manual focus.
65
f
Selecting the AF Mode
N
Pressing the shutter button
halfway activates the autofocus
and achieves focus once.
s
The AF point which achieves focus
flashes briefly. At the same time, the
focus confirmation light <
o
> in the
viewfinder is displayed.
s
With evaluative metering, the exposure setting
(shutter speed and aperture) will be set when
focus is achieved. The exposure setting and
focus will be locked as long as the shutter
button is pressed halfway. (p.69) You can then
recompose the shot while retaining the
exposure setting and point of focus.
While you press the shutter
button halfway, the camera
focuses continuously.
¡
This AF mode is for moving subjects when
the focusing distance keeps changing.
s
With predictive AF*, the camera can also
focus track a subject which steadily
approaches or retreats from the camera.
s
The exposure is set at the moment
the picture is taken.
One-Shot AF for Still Subjects
AF point
Focus
confirmation
light
AI Servo AF for Moving Subjects
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 fully. Recompose the
picture and try and focus again. Or see “When Autofocus Fails (Manual Focusing)” (p.70).
In a Creative Zone mode (except <
8
>), the beeper will not sound even when focus is
achieved. At the same time, the focus confirmation light <
o
> in the viewfinder will not light.
Содержание EOS 20D Digital
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