Nikon D700 User Manual page 313

a4: Focus Tracking with Lock-On
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This option controls how autofocus adjusts to sudden large
changes in the distance to the subject.
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AF5 Long
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When the distance to the subject changes abruptly, the
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camera waits for the specified period (long, normal, or
AF: (default)
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short) before adjusting the distance to the subject. This
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prevents the camera from refocusing when the subject is
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ne yo scure yo Jects passing t roug t e rame.
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stanc"e
Off
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to the subject changes. Use when photographing a series
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of subjects at varying distances in quick succession.
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as: AF Activation
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This option controls whether both the shutter-release button and
the AF·ON button can be used to initiate autofocus, or whether
autofocus is only initiated when the AF-ON button is pressed.
Option Description
Autofocus can be performed with the
AF-ON
button or by
pressing the shutter-release button halfway.
Shutter!
AF-ON
(default)
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AF-ON only Au
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can only be performed using the
AF-ON
button.
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