Canon A800 - Manual (Page 49)

49
You can use the digital zoom to zoom up to approximately 13x maximum, and
capture subjects that are too far away for the optical zoom to enlarge.
However, depending on the recording pixel setting
(p. 55) and zoom factor,
the images may appear coarse (the zoom factor will appear in blue).
Press the i zoom button.
z Hold the button until zooming stops.
X Zooming stops at the largest possible
zoom factor without image deterioration.
The zoom factor will appear on the screen
when you release the zoom button.
Press the i zoom button again.
X The digital zoom will zoom in even further
on the subject.
Zooming in More Closely on Subjects
(Digital Zoom)
Zoom Factor
Turning off the digital zoom
To turn off the digital zoom, press the n button to choose [Digital Zoom] from
the 4 tab, then choose [Off].
The focal length when using the optical zoom and digital zoom together is
approximately 37 – 488 mm, and 37 – 122 mm when using the optical
zoom alone (all focal lengths are 35mm film equivalent).