Nikon D300 D300 User's Manual - Page 296
a4: Focus Tracking with Lock-On, 3D-tracking, points, Option, Description, Normal, Short
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Option Description If the subject leaves the selected focus point, the camera will use 3D-tracking to track the subject f 51 points (3D-tracking) and select a new focus point as required. Use to 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. 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 3Dtracking 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. Option Description C Long When the distance to the subject changes abruptly, the UD Normal (default) camera waits for the specified period (long, normal, or short) before adjusting the distance to the subject. This E Short prevents the camera from refocusing when the subject is briefly obscured by objects passing through the frame. The camera immediately adjusts focus when the distance Off to the subject changes. Use when photographing a series of subjects at varying distances in quick succession. 270