70Taking Photographs—FocusFocus LockFocus lock can be used to change the composi tion after focusing, making itpossible to focus on a subject that will not be in one of the five focus areasin the final composition. It can also be used when the autofocus system isunable to focus ( 73).When AF-S is selected for Custom Setting 2 (Autofocus; 139), focuslocks automatically when the in-focus indicator (●) appears in the viewfinder.When AF-C is selected, focus must be locked manu al ly using the AE-L/AF-Lbutton. To recompose a photograph using focus lock:1 Position the subject in the selected focus area and press the shutter-re-lease button halfway to initiate focus.2 Check that the in-focus indicator (●) appears in the viewfinder.AF-S (Single-servo AF)Focus will lock automatically when the in-fo cus indicator appears, and remain lockeduntil you remove your finger from the shutter-re lease button. Focus can also be locked bypressing the AE-L/AF-L button (see below).AF-C (Continu ous-servo AF)Press the AE-L/AF-L button to lock both focusand exposure. Focus will remain locked whilethe AE-L/AF-L button is pressed, even if youlater remove your finger from the shutter-re-lease button.
