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Canon 300X - Focus Lock Technique; Using Focus Lock for Recomposition

Canon 300X
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30
3Selecting the AF point
Focus Lock
After achieving focus, you can lock the focus on a subject and
recompose the shot. This is called “focus lock.”
1
Select the desired AF point.
2
Focus the subject.
Aim the AF point on the subject,
then press the shutter button
halfway.
3
Keep pressing the shutter
button halfway and recompose
the picture as desired.
4
Take the picture.
If focus has not been achieved, the focus confirmation light <n>
in the viewfinder will blink. In this case, you cannot take a picture
even when you press the shutter button fully. Recompose the shot
and focus again or see “When Autofocus Fails” (p.31).
If you use an external, EOS-dedicated Speedlite and focus cannot
be achieved with the AF-assist beam, select the center AF point.
Focus lock also works in the Basic Zone modes (except <P>).
Just start from step
2 above.

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