Nikon D300 a4: Focus Tracking with Lock-On, Off, Long, Option, E Short, D Normal, 51 points, Description, A3D-tracking, (3D-tracking), OptionDescription

	Option	Description
		If the subject leaves the selected focus point, the
		camera will use 3D-tracking to track the subject
f	51 points	and select a new focus point as required. Use to
	(3D-tracking)	quickly 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.

A3D-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.

a4: Focus Tracking with Lock-On

This option controls how autofocus adjusts to sudden large changes in the distance to the subject.

OptionDescription

CLong When the distance to the subject changes abruptly, the

U	D Normal	camera waits for the specified period (long, normal, or
	(default)	short) before adjusting the distance to the subject. This
		prevents the camera from refocusing when the subject is
	E Short
		briefly obscured by objects passing through the frame.
	Off	The camera immediately adjusts focus when the distance
		to the subject changes. Use when photographing a
		series of subjects at varying distances in quick succession.

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