Canon PowerShot SX10 IS User Manual page 49

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Inplayback mode, you can select images with the control dial.
Turning itcounterclockwise selects the previous image while t urning
it clockwise selects the next image. Please also see Viewit_g Still
Images (p. 19).
_O, Viewing Magnified images
To CanceJ the Magnified DispJay:
Press the zoom lever toward _'-_. (You can also cancel it immediately
by pressing the MENU button.)