Nikon D700 a4: Focus Tracking with Lock-On, a5: AF Activation

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

D(default) 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.
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.

a5: AF Activation

This option controls whether both the shutter-release button and the Bbutton can be used to initiate autofocus, or whether autofocus is only initiated when the Bbutton is pressed.

Option	Description
Shutter/	Autofocus can be performed with the Bbutton or by
AF-ON
	pressing the shutter-release button halfway.
(default)

AF-ON only Autofocus can only be performed using the Bbutton.

U

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