A4: Focus Tracking With Lock-On; A5: Af Activation - Nikon D700 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.

Autofocus can be performed with the B button or by

pressing the shutter-release button halfway.

AF-ON only Autofocus can only be performed using the B button.

When the distance to the subject changes abruptly, the

camera waits for the specified period 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.

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