Nikon D300 - Manual (Page 107)

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Frame a picture in the monitor.
To magnify the view in the monitor up to 3 ×, press the X
button.
While the view through the lens is zoomed in, a
navigation window will appear in the bottom right
corner of the display. Use the multi selector to scroll
within the AF area brackets.
5
Focus.
Autofocus (focus mode S or C):
Press the shutter-release
button halfway or press the
B button. The camera will
focus normally and set
exposure. Note that the mirror will click back into place while
either button is pressed, temporarily interrupting live view.
Live view is restored when the button is released.
Manual focus (focus mode M; pg. 71): Focus using the lens
focusing ring.
X button
Exit