Nikon D3500 Reference Manual complete instructions - English - Page 96
Focus Lock, Auto-area AF
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Focus Lock Focus lock can be used to change the composition after focusing in AF-A, AF-S, and AF-C focus modes (0 62), making it possible to focus on a subject that will not be in a focus point in the final composition. If the camera is unable to focus using autofocus (0 65), focus lock can also be used to recompose the photograph after focusing on another object at the same distance as your original subject. Focus lock is most effective when an option other than e (Auto-area AF) is selected for AFarea mode (0 67). 1 Focus. Position the subject in the selected focus point and press the shutter-release button halfway to initiate focus. Check that the in-focus indicator (I) appears in the viewfinder (viewfinder photography) or that the focus point has turned green (live view). Viewfinder photography Live view A Autoexposure Lock Pressing the A (L) button in Step 2 also locks exposure (0 102). 72 More on Photography