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MANUAL FOCUSING
4 Depress the shutter release button fully to take a picture.
When the autofocus mode or the focus indicator is unsuitable for focusing.
When the autofocus function or the viewfinder focus indicator
in the viewfinder cannot be used for focus confirmation for the following reasons, focus on the subject in the manual focus mode with the aid of the matte field in the viewfinder as you would with a
a)The focus indicator 
blinks because the subject is difficult to autofocus.
b)The maximum aperture of the lens in use is smaller than f/5.6.
