Canon AF514XL-S - Manual (Page 66)

Notes
1. When you let go of the shutter trigger,
the focus will automatically unlock.
When you press the shutter trigger
again, the lens will automatically
refocus on your subject and then lock
that focus. This process is repeated
each time you release the shutter trig­
ger and then press it again.
2. Use the focus lock feature:
1 ) When you want to recompose the
picture after the focus is locked so
that your subject is not covering the
autofocus circle.
2) When you are panning to follow
your subject’s movement. (If you
pan when the focus mode switch is
on "N” and your subject, as it moves
across a scene, passes behind an
object closer to the camera, the
camera will automatically focus on
the closer object and your main
subject will be blurred).
3) To focus certain special types of
subjects (see pp. 40—42).
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