Nikon D100 Product Manual - Page 77

Taking Photographs-Focus Controlling How the Camera Focuses Autofocus When the focus mode selector is set to S (single-servo autofocus) or C (continuous-servo autofocus), the camera focuses automatically when the shutter-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: Mode Single-area AF * Dynamic-area AF Description The camera will focus on the subject in the selected focus area only. Choose this option when your composition is relatively static and you can predict that your subject will stay in the selected focus area. Camera uses information from multiple focus areas to determine 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 selected focus area. * Focus brackets are not displayed when closest subject priority ( 67) is in effect; only icon is displayed. 14-AE-L/AF-L ( 154) If AF-ON is selected for Custom Setting 14 (AE-L/AF-L), the camera can also be focused by pressing the AE-L/AF-L button. 65