Nikon 1 J1 Reference Manual page 164

Lock focus.
2
With the shutter-release button
pressed halfway, press 1 (A) to lock
both focus and exposure (an AE-L indi-
cator will be displayed; 0 118). Focus
will remain locked while 1 (A) is
pressed, even if you later remove your
finger from the shutter-release but-
ton.
A
See Also
For information on changing the role of
the 1 (A) button, see page 152.
3 Recompose the photograph and shoot.
Focus will remain locked between
shots if you keep 1 (A) pressed,
allowing several photographs in suc-
cession to be taken at the same focus
setting.
Do not change the distance between the camera and the sub-
ject while focus lock is in effect. If the subject moves, focus again
at the new distance.
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