Nikon D1X - Manual (Page 92)

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OGRAPHY—FOCUS LOCK
3 Keeping focus locked, recompose your photograph (A) and shoot (B).
A B
When focus is locked by pressing the shutter-release button halfway, you can take
several photographs in succession at the same focus setting by keeping the shut-
ter-release button lightly pressed between each shot. Focus will also remain
locked between shots as long as you continue to press the AE-L/AF-L button.
Do not change the distance between the camera and the subject while focus lock
is in effect. If your subject moves, focus again at the new distance.
21—AE-L/AF-L Button ( pg. 172)
The AE-L/AF-L button can be set to lock only focus, r ather than both focus and exposure.