Nikon S4 - Manual (Page 101)

91
T
echnical Notes
Getting Good Results with Autofocus
Autofocus performs best when there is contrast between the subject and the back-
ground and the subject is evenly lit. It does not perform well if the subject is very dark
or moving rapidly, if there are objects of sharply differing brightness in the scene (e.g.,
the sun is behind your subject and their features are in deep shadow), or if there are
several objects at different distances from the camera at the center of the frame (e.g.,
your subject is inside a cage).
Focus Lock
Focus and exposure are locked when the shutter-release button is pressed halfway,
and remain locked while the shutter-release button is held in this position (focus
lock). Focus lock can be used to take pictures of off-center subjects or in situations
in which the camera is unable to focus using autofocus.
* Do not change distance between camera and subject while focus lock is in effect.
If subject moves, release shutter-release button and focus again at new distance.
Focus and exposure are locked while shut-
ter-release button is pressed halfway.
*
Recompose picture
3
Position subject in center of frame and
press shutter-release button halfway.
Focus
1
Check that focus indicator glows steadi-
ly, indicating that subject is in focus.
Check focus indicator
2
Press shutter-release button rest of way
down to take picture.
Take picture
4
AUTO AUTO AUTO 9 9 AUTO AUTO AUTO 9 9
AUTO AUTO AUTO 9 9
Appendix