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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.
Set the Mode Dial to any setting
except <1> (Full Auto).
Select the desired AF point.
Focus the subject.
Move the AF point over the subject
and press the shutter button halfway.
Keep pressing the shutter button
halfway and recompose the
picture as desired.
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.