Nikon D810 Product Manual - Page 122
Locking Focus with the, Button, See Also, AE-L/AF-L, AF-ON only, AF activation, Focus, AF-S priority
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A Locking Focus with the B Button During viewfinder photography, focus can be locked using the B button in place of the shutter-release button (0 88). If AF-ON only is selected for Custom Setting a4 (AF activation, 0 308), the camera will not focus when the shutter-release button is pressed halfway; instead, the camera will focus when the B button is pressed, at which point focus will lock and remain locked until the B button is pressed again. The shutter can be released at any time, although the in-focus indicator (I) will not be displayed in the viewfinder. Note, however, that if Focus is selected for Custom Setting a2 (AF-S priority selection, 0 307) and single-point AF is selected for AF-area mode, the shutter will not be released if the camera is unable to focus in single-servo autofocus mode. A See Also See Custom Setting c1 (Shutter-release button AE-L, 0 319) for information on using the shutter-release button to lock exposure, Custom Setting f6 (Assign AE-L/AF-L button, 0 349) for information on choosing the role played by A AE-L/AF-L button. 98