Nikon D800 User Manual (en)

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U
This option controls how autofocus adjusts to sudden large 
changes in the distance to the subject when AF-C (
0 91) is selected 
during viewfinder photography.
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.
a3: Focus Tracking with Lock-On
G button
➜ A Custom Settings menu
Option
Description
5 (Long)
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.
4
3 (Normal)
2
1 (Short)
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.
a4: AF Activation
G button
➜ A Custom Settings menu