Nikon 25464 D300S User's Manual - Page 106
Focus Lock
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Focus Lock Focus lock can be used to change the composition after focusing, making it possible to focus on a subject that will not be in a focus point in the final composition. It can also be used when the autofocus system is unable to focus (0 82). 1 Focus. Position the subject in the selected focus point and press the shutter-release button halfway to initiate focus. 2 Check that the in-focus indicator (I) appears in the viewfinder. N 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 following page). A Shutter-Release Button AE-L If On is selected for Custom Setting c1 (Shutter-release button AE-L; 0 273), exposure will lock when the shutter-release button is pressed halfway. 80