Nikon D7100 - Manual (Page 105)

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N
A Locking Focus with the AF-ON Button
If desired, the autofocus can be assigned to a separate button in the Custom Settings menu,
in which case focus will lock when the button is pressed and remain locked until the button
is pressed again. The shutter can be released at any time regardless of the options selected
for Custom Settings a1 (AF-C priority selection, 0 231) and a2 (AF-S priority selection,
0 231), and the in-focus indicator (I) will not be displayed in the viewfinder.
A See Also
See Custom setting c1 (Shutter-release button AE-L, 0 236) for information on using the
shutter-release button to lock exposure, Custom Setting f4 (Assign AE-L/AF-L button,
0 256) for information on choosing the role played by the A AE-L/AF-L button.