Canon A580 - Manual (Page 58)

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About the Safety Zoom
Depending on the number of recording pixels set, you can shift from
optical zoom to digital zoom without pausing up to a factor where the
image quality does not deteriorate (Safety Zoom).
displays when
reaching the maximum zoom factor without image deterioration.
Pressing the zoom lever toward
again allows you to zoom even
further (not available in ).
Depending on the number of recording pixels set, the Safety Zoom
zone varies as follows.
z The digital zoom cannot be used when the LCD monitor is
turned off.
z The digital zoom cannot be used in (Date Stamp) or
(Widescreen) modes.
Safety Zoom Factor
: Zone without deterioration : Zone with deterioration
Recording pixels Optical zoom Digital zoom