Nikon D7100 - Manual (Page 104)

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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 72), 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 73).
1
Focus.
Position the subject in the selected focus point
and press the shutter-release button halfway to
initiate focus. Check that the in-focus 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 f icon will be displayed
in the viewfinder). Focus and exposure 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 focus mode : Focus locks automatically when the in-focus
indicator (I) appears, 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).
3
Recompose the photograph and shoot.
Focus will remain locked between shots if you
keep the shutter-release button pressed halfway
(AF-S) or keep the A AE-L/AF-L button pressed,
allowing several photographs in succession to
be taken at the same focus setting.
Do not change the distance between the camera and the subject while focus lock is
in effect. If the subject moves, focus again at the new distance.
Shutter-release
button
A AE-L/AF-L
button