78Taking Photographs—FocusAutofocusWhen the focus mode selector is set to S (single-servo autofocus) or C (con-tin u ous-servo autofo cus), the camera focuses auto mati cally when the shut-ter-release button is pressed halfway. This section describes focus optionsthat are only available in single- and con tinu ous-servo AF.AF-Area ModeAF-area mode determines how the focus area isselected in autofocus mode. To select the AF-areamode, rotate the AF-area mode selector. The se-lected mode is shown by an icon in the top controlpanel (see following page).Manual FocusSingle-area AF is automatically selected when manual focus is used.The Top Control PanelThe selected focus area or group of focus areas is shown in the top control panel insingle-area AF, dynamic-area AF, and group dynamic-AF. The illustrations in the “Icon”column show the display when the center focus area or focus area group is selected.The top control panel display does not show the focus area selected by the camera fordynamic-area AF with closest subject priority.a1—AF-C Mode Priority ( 185)In focus mode C (continuous-servo autofocus) photographs can be taken even whenthe camera is not in focus (release priority). To ensure that the camera is in focus whenthe picture is taken, choose Focus for Custom Setting a1 (AF-C mode priority). Se-lect FPS rate + AF for improved focus during continuous shooting.a2—AF-S Mode Priority ( 185)In focus mode S (single-servo autofocus) photographs can be taken only when thecamera is in focus (focus priority). To allow photographs to be taken regardless ofwhether or not the camera is in focus, choose Release for Custom Setting a2 (AF-Smode priority).a3—Group Dynamic AF ( 186)This option controls how focus areas are grouped in group dynamic-AF mode andwhether the camera tracks the subject in the center focus area of the selected group.a4—Lock-On ( 188)This option controls whether the camera immediately adjusts focus to track a subjectwhen the distance to the subject changes drastically.
