Canon EOS 20D Instruction Manual

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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.
1
Set the Mode Dial to a Creative 
Zone mode.
2
Select the desired AF point.
3
Focus the subject.
¡
Move the AF point over the subject 
and press the shutter button halfway.
4
Keep pressing the shutter button 
halfway and recompose the 
picture as desired.
5
Take the picture.
Focusing an Off-Center Subject
If the AF mode is AI Servo AF (or AI Focus AF set to Servo mode), focus 
lock will not work.
Focus lock is also possible in Basic Zone modes (except <
5
5
5
5>). In this 
case, start from step 3.