Canon EOS 30D - Using Focus Lock

Using Focus Lock
After achieving focus, you can lock the focus on a subject and
recompose the shot. This
is called "focus lock." Focus lock works only
in the One-Shot AF mode.
Set the Mode Dial to a Creative
Zone mode.
Select the desired AF point.
(p.??)
Focus the subject.
Move the AF point over the subject
and press the shutter button halfway.
I
Keep pressing the shutter button
halfway and recompose the
picture as desired.
Take the picture.
o If the AF mode is AI Servo AF (or AI Focus AF set to Servo mode), focus
lock will not work.
[i] Focus lock is also possible in Basic Zone modes (except <~». In this
case, start from step
3.
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