Focus Lock - Nikon D40 Owner's Manual

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 area in the final composition. It can also be
used when the autofocus system is unable to focus (
ommended when 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 view-
finder. Focus will lock automatically when the in-focus indica-
tor appears, and remain locked while the shutter-release
button is pressed halfway. Focus can also be locked by press-
ing the AE-L/AF-L button while the shutter-release button is
pressed halfway. Focus will remain locked while the AE-L/AF-L
button is pressed, even if you later remove your finger from
the shutter-release button.
3
Recompose the photograph and shoot.
The shutter-release button can not be used to lock focus in
shooting mode (
lock focus. At other settings, focus will remain locked between shots if the shutter-release
button is kept pressed halfway.
12—AE-L/AF-L (
This option controls the behavior of the
26 Reference: More on Photography (All Modes)/Focus
32), or continuous servo autofocus (
77)
AE-L/AF-L
Controls used Shutter-release button/AE-L/AF-L button
27). Single or dynamic area AF is rec-
24).
button.
mode ( 19), continuous
23). Use the AE-L/AF-L button to