Nikon D3400 - AF-Area Mode

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AF-Area Mode
Choose how the focus point for autofocus is selected. The
following options are available during viewfinder photography:
Note that d (Dynamic-area AF) and f (3D-tracking (11
points)) AF-area modes are not available when AF-S is selected
for focus mode.
Option Description
c
Single-point
AF
For stationary subjects. Focus point is selected
manually; camera focuses on subject in selected
focus point only.
d
Dynamic-area
AF
For non-stationary subjects. In AF-A and AF-C focus
modes, user selects focus point using multi
selector (0 76), but camera will focus based on
information from surrounding focus points if
subject briefly leaves selected point.
f
3D-tracking
(11 points)
In AF-A and AF-C focus modes, user selects focus point
using multi selector (0 76).
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.
e Auto-area AF
Camera automatically detects subject and
selects focus point.
A 3D-Tracking (11 Points)
If subject leaves the viewfinder, remove your finger from the shutter-
release button and recompose the photograph with the subject in the
selected focus point.
Note that when the shutter-release button is
pressed halfway, the colors in the area surrounding the focus point are
stored in the camera.
Consequently 3D-tracking may not produce the
desired results with subjects that are similar in color to the background
or that occupy a very small area of the frame.