Nikon D5100 - Manual (Page 40)

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Focus
This section describes the focus options available when photographs are framed in
the viewfinder.
Focus Mode
Choose from the following focus modes. Note that AF-S and AF-C are available only in
modes P, S, A, and M.
1
Place the cursor in the information display.
If shooting information is not displayed in the monitor, press the P button.
Press the P button again to place the cursor in the information display.
2
Display focus-mode options.
Highlight the current focus mode in the
information display and press
J.
Option Description
AF-A
Auto-servo
AF
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.
AF-S
Single-servo
AF For stationary subjects. Focus locks when shutter-release button is
pressed halfway. Shutter can only be released if camera is able to focus.
AF-C
Continuous-
servo AF
For moving subjects. Camera focuses continuously while shutter-
release button is pressed halfway. If subject moves, camera will engage
predictive focus tracking to predict final distance to subject and adjust
focus as necessary. At default settings, shutter can only be released if
camera is able to focus.
MF Manual focus
Focus using the lens focus ring (if the lens is equipped with an M/A-M or
A-M mode switch, slide the switch to M before focusing).
Information display P button