Nikon D7200 User Manual page 118

2
Lock focus.
AF-A and AF-C focus modes (viewfinder
Shutter-release button
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.
A AE-L/AF-L 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).
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