Canon IXUS 120 IS - Manual (Page 83)

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While the shutter button is pressed halfway, the focus and exposure will
continue to adjust, allowing you to take pictures of moving subjects without
missing a shot.
Choose [Servo AF].
● Press the n button and choose
[Servo AF] on the 4 tab, and use the qr
buttons to choose [On].
Focus.
● Focus and exposure will be maintained
where the blue AF frame appears while
you press the shutter button halfway.
● If a face is not detected when AF Frame is
set to [Face AiAF], the AF frame will be
set to [Center].
Shooting with Servo AF
• The camera may not be able to focus and exposure in some conditions.
• If a correct exposure cannot be obtained, the shutter speed and aperture
value are shown in orange. Take your finger off the shutter button, then
press it again halfway.
• You cannot shoot with the AF lock in this mode.
• You cannot set the Servo AF mode if you have set the [AF-Point Zoom]
option in the
4 tab to [On].
• Not available in Self-Timer (pp. 63 , 64 , 75 , 76) .