Nikon D750 Product Manual - Page 157

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. If the camera is unable to focus using autofocus (0 131), 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 auto-area AF is selected for AF-area mode (0 123). 1 Focus. Position the subject in the selected focus point and press the shutter-release button halfway to initiate focus. Check that the infocus indicator (I) appears in the viewfinder. 2 Lock focus. AF-A and AF-C focus modes: With the shutter-release button pressed halfway (q), press the A AE-L/AF-L button (w) to lock both focus and exposure (an AE-L icon will be displayed in the viewfinder). Focus will remain locked while the A AE-L/ AF-L button is pressed, even if you later remove your finger from the shutter-release button. Shutter-release button A AE-L/AF-L button 129