Canon IXUS 1000 HS - Manual (Page 57)

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You can use the digital zoom to zoom up to approximately 40x and capture
subjects that are too far away for the optical zoom to enlarge. The images
may appear coarse, however, depending on the recording pixel setting
(p. 74)
and the zoom factor used.
Move the zoom lever toward i.
● Hold the lever until zooming stops.
 The zoom will stop when the largest
possible zoom factor without image
deterioration has been reached, and the
zoom factor will appear when you release
the zoom lever.
Move it toward i again.
 The digital zoom will zoom in even further
on the subject.
Zooming in More Closely on Subjects
(Digital Zoom)
Zoom Factor
What if the zoom factor appears in blue?
Images shot at zoom factors that appear in blue will be coarse.
Turning off the digital zoom
To turn off the digital zoom, press the n button to choose [Digital Zoom] in
the 4 tab, then choose [Off].
The focal length when using the optical zoom and digital zoom together is
36 – 1440 mm, and 36 – 360 mm when using the optical zoom alone
(all focal lengths are 35mm film equivalent).