A4: Focus Tracking With Lock-On; A5: Af Activation - Nikon D3S User Manual

a4: Focus Tracking with Lock-On

This option controls how autofocus adjusts to sudden large
changes in the distance to the subject during continuous-servo AF.
Option
C 5 (Long)
( 4
D 3 (Normal)
) 2
E 1 (Short)
Off

a5: AF Activation

If Shutter/AF-ON is selected, both the
shutter-release button and the B button
can be used to initiate autofocus. If AF-ON
only is selected, autofocus is only initiated
when the B button is pressed.
U
298
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.
G button A Custom Settings menu
Description
G button A Custom Settings menu