A4: Focus Tracking With Lock-On; A5: Af Activation - Nikon D3 User Manual

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a4: Focus Tracking with Lock-On

This option controls how autofocus adjusts to sudden large

changes in the distance to the subject.

This option controls whether both the shutter-release button and

the B button can be used to initiate autofocus, or whether

autofocus is only initiated when the B button is pressed.

When the distance to the subject changes abruptly, the

camera waits for the specified period (long, normal, or

short) before adjusting the distance to the subject. This

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

to the subject changes. Use when photographing a series

of subjects at varying distances in quick succession.

Autofocus can be performed with the B button or by

pressing the shutter-release button halfway.

Autofocus can only be performed using the B button.