Canon A590 IS - Manual (Page 84)

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z Adjust the zoom setting before shooting. The combined
digital and optical zoom factor will display on the LCD
monitor. When the zoom factor displays in blue, the image
will deteriorate.
z You can use digital zoom during the movie shooting in
mode only.
z QuickTime is required to play back movies (Data type: AVI/
Compression method: Motion JPEG) on a computer
(Windows 2000 only).