Nikon D3S - Manual (Page 86)

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4
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; 0 99): Focus using the lens focus
ring.
5
Take the picture.
Press the shutter-release button the rest of the way
down to reset focus and exposure and take the
picture. The monitor turns off during shooting and turns back
on once the photograph is recorded.
6
End live view.
Press the a button to end live view.