Canon EOS D30 - Manual (Page 62)

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Focusing On an Off-Center Subject
To focus on a subject not covered by one of the three focusing points, follow the procedure
below. This technique is called Focus Lock.
Focus lock is valid when the AF mode is set to One-shot AF.
1 Select a focusing point.
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2 Focus on the subject.
● Place the focusing point over the subject
and press the shutter button down halfway.
3 Hold the shutter button down
halfway and recompose the
picture.
4 Take the picture.
For best results, use the combination of One-shot AF with AE lock applied on the
focusing point where focus is achieved, and evaluative metering.
You can also use the Focus lock function in the Easy Shooting zone (except for
〈 〉
mode), starting from step 2.