Nikon D7200 body - Manual (Page 118)

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Lock focus.
AF-A and AF-C focus modes (viewfinder
photography)
: With the shutter-release
button pressed halfway (q), press the
A AE-L/AF-L button (w) to lock focus.
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.
AF-S (viewfinder photography) and live view : Focus locks
automatically and remain locked until you remove your
finger from the shutter-release button. Focus can also be
locked by pressing the
A AE-L/AF-L button (see above).
Shutter-release button
A AE-L/AF-L button