Nikon D5100 - Manual (Page 42)

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AF-Area Mode
Choose how the focus point for autofocus is selected. Note that d (Dynamic-area
AF) and f (3D-tracking (11 points)) are not available when AF-S is selected for
focus mode.
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 AF-area mode options.
Highlight the current AF-area mode in the
information display and press
J.
3
Choose an AF-area mode.
Highlight an AF-area mode and press J. To
return to shooting mode, press the shutter-
release button halfway.
Option Description
c Single-point AF
User selects focus point using multi selector; camera focuses on
subject in selected focus point only. Use with stationary subjects.
d Dynamic-area AF
In AF-A and AF-C focus modes , user selects focus point using multi selector,
but camera will focus based on information from surrounding focus
points if subject briefly leaves selected point. Use with erratically
moving subjects.
f
3D-tracking
(11 points)
In AF-A and AF-C focus modes , user selects focus point using multi selector.
If subject moves after camera has focused, camera uses 3D-tracking
to select new focus point and keep focus locked on original subject
while shutter-release button is pressed halfway. If subject leaves
viewfinder, remove your finger from shutter-release button and
recompose photograph with subject in selected focus point.
e Auto-area AF Camera automatically detects subject and selects focus point.
Information display P button