Nikon D300 User Manual page 111

To magnify the view in the monitor up to 13 x and check
focus, press the _ 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
to areas of the frame not visible in the monitor.
Press 0 to exit zoom.
7 Takethe picture.
Press the shutter-release
button the rest of the way
down to take the picture. If
continuous high speed or
continuous low speed is
selected for [Release mode], the monitor will turn off while the
shutter-release button is pressed.
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