Canon EOS 30D - Manual (Page 74)

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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 .
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 ModeN
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
instruction manual.
<AF> stands for auto focus. <MF> stands for manual focus.