Canon IXUS 55 - Manual (Page 38)

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You can shoot zoomed images using the combined digital and
optical zooms.
Stills: zoom up to approximately 12 times
Movies (Standard): zoom up to approximately 12 times
Images become coarser the more they are digitally zoomed.
Using the Digital Zoom
Shooting Mode
The digital zoom cannot be used when the LCD monitor is
turned off.
1 (Rec.) Menu [Digital Zoom] [On].
See Menus and Settings (p. 27) .
2 Press the zoom lever toward and shoot.
The combined digital and optical zoom setting will display in
the LCD monitor.
When you press the zoom lever toward , the zoom stops
when the lens reaches the maximum optical telephoto set-
ting (when shooting still images).
Press the zoom lever toward
again to activate the digital
zoom and further zoom the image digitally.
Press the zoom lever toward to zoom out.