Using Autofocus (Af) - Canon EOS 1D Instructions Manual

Using Autofocus
The Area AF ellipse has 45 AF points. By selecting the optimum AF
point, autofocusing can be executed while you maintain the desired
subject framing. You can also set the AF mode to suit the subject
or intended effect.
3
First set the < > switch and <
(AF)
> switch to < >.
3 3
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