The focus area for autofocus is shown in the viewfinder. Choosing a different focus
area shifts focus to another part of the frame. This selection can be made by the
photographer or left up to the camera: what controls how the focus point is selected
is AF-area mode.
The focus area display in the viewfinder shows the area of the frame that the camera will use to set focus. In 3D-tracking and single-point and dynamic-area AF, photographers can choose the focus area themselves.
For stationary subjects. Focus point is selected manually; camera focuses on subject in selected focus point only.
For non-stationary subjects. 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.
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.
Camera automatically detects subject and selects focus point.