Canon A590 IS - Manual (Page 81)

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z If the zoom is adjusted after these values are set, the
aperture value or the shutter speed may change in
accordance with the zoom position
(p. 75) .
z The brightness of the LCD monitor matches the selected
shutter speed and aperture value. When you select a fast
shutter speed or shoot a subject that appears dark, set the
flash to
(Flash on) to make the LCD monitor display
bright.