Nikon D100 - Manual (Page 77)

Taking Photographs—Focus
Controlling How the Camera Focuses
65
Autofocus
When the focus mode selector is set to S (single-servo autofocus) or C (con-
tinuous-servo autofocus), the camera focuses automatically when the shut-
ter-release button is pressed halfway. This section describes focus options
that are only available in single- and continuous-servo AF.
AF-Area Mode
Pressing the shutter-release button halfway initiates autofocus. AF-area mode
determines what happens if the subject moves out of the selected focus area
while the camera is still focusing. Two options are available:
14—AE-L/AF-L ( 154)
If AF-ON is selected for Custom Setting 14 (AE-L/AF-L), the camera can also be fo-
cused by pressing the AE-L/AF-L button.
Single-area AF
The camera will focus on the subject in the selected focus
area only. Choose this option when your composition is rel-
atively static and you can predict that your subject will stay
in the selected focus area.
*
Dynamic-area AF
Camera uses information from multiple focus areas to de-
termine focus. If the subject leaves the selected focus area
even briefly, the camera will still be able to focus based on
information from other focus areas (the focus area selected
in the viewfinder does not change). Choose this option when
you are following an erratically moving subjects and in other
cases in which it is difficult to keep your subject in the se-
lected focus area.
Mode Description
* Focus brackets are not displayed when closest subject priority ( 67) is in effect; only
icon is displayed.