Nikon D5100 Guide D’Exploitation

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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
Single-point AF 
User selects focus point using multi selector (
0 43); camera focuses 
on subject in selected focus point only. Use with stationary subjects.
Dynamic-area AF
In AF-A and AF-C focus modes
, user selects focus point using multi selector 
(
0 43), 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 
(
0 43). 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.
Auto-area AF
Camera automatically detects subject and selects focus point.
Information display
P button