Canon POWERSHOT PRO1 User Manual page 44

Using the Zoom (Focal Length) (continued)
Wide
Angle
Digital Zoom
An image already zoomed with the optical
zoom lens can be further zoomed digitally up
to an approximate factor of 22 (p. 78).
The factor displays after the zoom operation.
The digital zoom cannot be used with certain Shooting modes
(p. 206).
The more the image is zoomed digitally, the coarser its image
quality becomes.
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Zooming Rapidly
To zoom in or out rapidly, turn the mode
lever to
the zoom ring in either the zoom in or zoom
out direction. The swift zooming continues
while you hold the mode lever.
To reverse the zooming direction, turn the
zoom ring a little in the opposite direction
while holding the mode lever.
Telephoto
(Shooting) and hold it, then turn