Nikon D3100 User Manual page 49

Focus
This section describes the focus options available when photographs are framed in
the viewfinder. Focus can be adjusted automatically or manually (see "Focus Mode,"
below), and the focus point for automatic or manual focus can be selected using the
multi selector.
Focus Mode
Choose from the following focus modes. Note that
AF-S
and
AF-(
are available only in
modes P, S, A, and M.
Option
AF-A Auto-servo
AF
AF-S
Single-servo
AF
Continuous-
AF-(
servo AF
MF
Manual focus
Description
Camera automatically selects single-servo autofocus if subject is
stationary, continuous-servo autofocus if subject is moving. Shutter can
only be released if camera is able to focus.
For stationary subjects. Focus locks when shutter-release button is
pressed halfway. Shutter can only be released if camera is able to focus.
For moving subjects. Camera focuses continuously while shutter-
release button is pressed halfway. Shutter can only be released if
camera is able to focus.
Focus using the lens focus ring (if the lens is equipped with an AIM
switch, slide the switch to M before focusing).
1
Place the cursor in the information display.
If shooting information is not displayed in the monitor, press the
-0-
button.
Press the
-0-
button again to place the cursor in the information display.
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2
Display focus-mode options.
Highlight the current focus mode in the
information display and press €B).
43