Nikon D3s Body Only D3S User's Manual - Page 323

Option Description d 21 points If the subject leaves the selected focus point, the camera will focus based on information from the surrounding 20 focus points. Choose when photographing subjects that are moving unpredictably (e.g., players at a football game). e 51 points If the subject leaves the selected focus point, the camera will focus based on information from the surrounding 50 focus points. Choose when photographing subjects that are moving quickly and can not be easily framed in the viewfinder (e.g., birds). If the subject leaves the selected focus point, the camera will use 3D-tracking to track the subject and f 51 points select a new focus point as required. Use to quickly (3D-tracking) compose pictures with subjects that are moving erratically from side to side (e.g., tennis players). If the subject leaves the viewfinder, remove your finger from the shutter-release button and recompose the photograph with the subject in the selected focus point. A 3D-tracking 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 the same color as the background or that occupy a very small area of the frame. A See Also For information on using the Fn button and command dials to select the number of focus points for dynamic-area AF, see Custom Setting f4 U (Assign Fn button) > Fn button + command dials > Dynamic AF area (0 319). 297