Nikon D100 Product Manual - Page 82

Taking Photographs-Focus Focus Focus Lock Focus lock can be used to change the composition after focusing, allowing you to focus on a subject that will not be in one of the five focus areas in the final composition. You can also use it when the autofocus system is unable to focus ( 73), by first locking focus on another object at the same distance, then recomposing your photograph with the intended subject in the frame. In single-servo AF, focus locks automatically when the in-focus indicator (●) appears in the viewfinder. In continuous-servo AF, focus must be locked manually using the AE-L/AF-L button. To recompose a photograph using focus lock: 1 Position the subject in the selected focus area and press the shutter-release button halfway to initiate focus. 2 Check that the in-focus indicator (●) appears in the viewfinder. Single-servo AF Focus will lock automatically when the in-focus indicator appears, and remain locked until you remove your finger from the shutter-release button. Focus can also be locked by pressing the AE-L/AF-L button (see below). Continuous-servo AF Press the AE-L/AF-L button to lock both focus and exposure. Focus will remain locked while the AE-L/AF-L button is pressed, even if you later remove your finger from the shutter-release button. 70