Nikon D3S - Manual (Page 82)

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4
Focus.
Autofocus (focus mode S or C): In
tripod mode, the focus point for
contrast-detect autofocus can
be moved to any point in the
frame using the multi selector.
n is displayed when the focus
point is at the center of the
frame except when the view through the lens is zoomed in.
To focus using contrast-detect
autofocus, press the
B button. The
focus point will blink green and the
monitor may brighten while the camera
focuses. If the camera is able to focus
using contrast-detect autofocus, the
focus point will be displayed in green; if
the camera is unable to focus, the focus point will blink red.
Manual focus (focus mode M; 0 99): Use zoom for precise focus.
D
Contrast-Detect Autofocus
The camera will not continue to adjust focus while the B button
is pressed in continuous-servo autofocus mode. In both single-
servo and continuous-servo autofocus modes, the shutter can be
released even when the camera is not in focus.
Contrast-detect focus point
B button