Canon D20 - Manual (Page 62)

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When distant subjects are too far away to enlarge using the optical zoom, use
digital zoom for up to about 20x enlargement.
Press the i zoom button.
Hold the button until zooming stops.
X Zooming stops at the largest possible zoom
factor (before the image becomes grainy),
which is displayed when you release the
zoom button.
Press the i zoom button again.
X The camera zooms in even closer on the
subject, using digital zoom.
Common, Convenient Features
Zooming In Closer on Subjects (Digital Zoom)
Still Images Movies
Zoom Factor
• Zoomed images may look grainy, under some resolution settings
(p. 68) and zoom factors. In this case, the zoom factor is shown in
blue.
• Focal length when optical and digital zoom are combined is as follows (35mm
film equivalent).
28 – 560 mm (28 – 140 mm with optical zoom alone)
• To deactivate digital zoom, press the n button, choose [Digital Zoom] on
the 4 tab, and then choose [Off].