Nikon D3S - Manual (Page 116)

90
N
Focus Mode
Focus mode is controlled by the
focus-mode selector on the front of
the camera. There are two
autofocus (AF) modes, in which the
camera focuses automatically
when the shutter-release button is
pressed halfway, and one manual
focus mode, in which focus must be adjusted manually using the
focus ring on the lens:
Choose single-servo AF for landscapes and other stationary
subjects. Continuous-servo AF may be a better choice with
erratically-moving subjects. Manual focus is recommended when
the camera is unable to focus using autofocus.
Option Description
S
Single-servo
AF
Camera focuses when shutter-release button is pressed
halfway. Focus locks when in-focus indicator (
I) appears
in viewfinder, and remains locked while shutter-release
button is pressed halfway (focus lock).
At default settings,
shutter can only be released when in-focus indicator is
displayed (focus priority).
C
Continuous-
servo AF
Camera focuses continuously while shutter-release button
is pressed halfway. If subject moves, camera will engage
predictive focus tracking (
0 91) to predict final distance to
subject and adjust focus as necessary. At default settings,
shutter can be released whether or not subject is in focus
(release priority).
M
Manual
( 0 99)
Camera does not focus automatically; focus must be
adjusted manually using the lens focus ring.
If maximum
aperture of lens is f/5.6 or faster, viewfinder focus indicator
can be used to confirm focus (electronic range finding;
0 100), but photographs can be taken at any time,
whether or not subject is in focus.
Focus-mode selector