Canon EOS 20D - Manual (Page 64)

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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 <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 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
instructions.
<AF> stands for auto focus. <MF> stands for manual focus.