Nikon D3100 User Manual page 51

AF-Area Mode
Choose how the focus point for autofocus is selected. Note that
[3D]
(3D-tracking
(11 points)) is not available when AF-S is selected for focus mode.
Option
(n]
Single-point AF
(.(].] Dynamic-area AF
(-] Auto-area AF
[3D]
3D-tracking
(11 points)
Description
User selects focus point using multi selector; camera focuses on
subject in selected focus point only. Use with stationary subjects.
User selects focus point using multi selector. InAF-AandAF-Cfocusmodes,
camera will focus based on information from surrounding focus
points if subject briefly leaves selected point. Use with erratically
moving subjects. In AF-S focus mode, camera focuses on subject in
selected focus point only.
Camera automatically detects subject and selects focus point.
In AF-A and AF-Cfocus 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.
1
Place the cursor in the information display.
If shooting information is not displayed in the monitor, press the
~O~
button.
Press the
~O~
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
<@.
3
Choose an AF-area mode.
Highlight one of the following options and press
<@. To return to shooting mode, press the
shutter-release button halfway.
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