Canon A540 - Manual (Page 52)

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It may be difficult to focus on the following types of subjects.
!
Subjects with extremely low contrast to the surroundings
! Scenes with a mixture of near and far subjects
! Subjects with extremely bright objects at the center of the
composition
! Subjects that are moving quickly
! Subjects 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.
Shooting with the AF Lock
Shooting Hard-to-Focus Subjects
(Focus Lock, AF Lock, Manual Focus)
PowerShot A540
PowerShot A530
1
Aim the camera so that an object at the
same focal distance as the main subject is
centered in the viewfinder or in the AF frame
displayed on the LCD monitor.
2
Press the shutter button halfway.
3
Re-aim the camera to compose the shot as
desired and press the shutter button fully.
1
Turn on the LCD monitor.
2
Aim the camera so that an object at the
same focal distance as the main subject is
centered in the AF frame.