Canon eos 40d 1901b014 ユーザーズマニュアル

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Select the AF mode suiting the shooting conditions or subject. In the 
Basic Zone modes, the optimum AF mode is set automatically.
1
On the lens, set the focus mode 
switch to <
f>.
2
Set the Mode Dial to a Creative 
Zone mode.
3
Press the <o> 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
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 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 Creative Zone modes, AF is also possible by pressing the 
<p> button.
f: Selecting the AF ModeN
One-Shot AF for Still Subjects