Canon POWERSHOT SD630 DIGITAL ELPH User Manual page 49

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It may be difficult to focus on the following types of subjects.
oSubjects with extremely low contrast to the surroundings
oScenes with a mixture of near and far subjects
oSubjects with extremely bright objects at the center of the composition
eSubjects that are moving quickly
oSubjects through glass: Try to shoot as close to the glass as
possible to reduce the chances of light reflecting back off the glass.
Shooting with the Focus Lock
The focus lock can be used in any shooting mode.
same focal distance as the main subject is 5"
centered in the AF frame,
desired and press the shutter button fully,
Shooting with the AF Lock
The AF lock can be used in the r_ [_, [], [] or [] mode.
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