Canon A800 - Manual (Page 75)

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If you press the shutter button halfway, the AF frame will magnify and you can
check the focus.
Choose [AF-Point Zoom].
z Press the n button to choose [AF-
Point Zoom] from the 4 tab, then press
the qr buttons to choose [On].
Check the focus.
z Press the shutter button halfway.
X In [Face AiAF] (p. 73) , the face detected as
the main subject will appear magnified.
X In [Center] (p. 74) , the contents of the
center AF frame will appear magnified.
Magnifying the Focal Point
What if the display does not magnify?
The display will not appear magnified in [Face AiAF] if a face cannot be detected
or is too big in relation to the screen. In [Center], it will not appear magnified if the
camera cannot focus.
The magnified display will not appear when using the digital zoom (p. 49) ,
digital tele-converter (p. 50) or when using a TV as a display (p. 79) .