Nikon D100 User Manual
Page 82
Taking Photographs—Focus
Focus
70
Focus Lock
Focus lock can be used to change the composition after focusing, allowing
you to focus on a subject that will not be in one of the five focus areas in the
final composition. You can also use it when the autofocus system is unable to
focus (
73), by first locking focus on another object at the same distance,
then recomposing your photograph with the intended subject in the frame.
In single-servo AF, focus locks automatically when the in-focus indicator (●)
appears in the viewfinder. In continuous-servo AF, focus must be locked manu-
ally using the AE-L/AF-L button. To recompose a photograph using focus
lock:
1
Position the subject in the selected focus area
and press the shutter-release button halfway
to initiate focus.
2
Check that the in-focus indicator (●) appears
in the viewfinder.
Single-servo AF
Focus will lock automatically when the in-fo-
cus indicator appears, and remain locked until
you remove your finger from the shutter-release
button. Focus can also be locked by pressing
the AE-L/AF-L button (see below).
Continuous-servo AF
Press the AE-L/AF-L button to lock both focus
and exposure. Focus will remain locked while
the AE-L/AF-L button is pressed, even if you
later remove your finger from the shutter-re-
lease button.