Nikon D3400 Reference Manual - English - Page 103

Focus Lock, Focus.

Page 103 highlights

Focus Lock Focus lock can be used to change the composition after focusing in AF-A, AF-S, and AF-C focus modes (0 69), making it possible to focus on a subject that will not be in a focus point in the final composition. If the camera is unable to focus using autofocus (0 72), focus lock can also be used to recompose the photograph after focusing on another object at the same distance as your original subject. Focus lock is most effective when an option other than e (Auto-area AF) is selected for AFarea mode (0 74). 1 Focus. Position the subject in the selected focus point and press the shutter-release button halfway to initiate focus. Check that the in-focus indicator (I) appears in the viewfinder (viewfinder photography) or that the focus point has turned green (live view). Viewfinder photography Live view A Autoexposure Lock Pressing the A (L) button in Step 2 also locks exposure (0 113). More on Photography 79

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79
More on Photography
F
ocus Lock
Focus lock can be used to change the composition after focusing
in
AF-A
,
AF-S
, and
AF-C
focus modes (
0
69), making it possible to
focus on a subject that will not be in a focus point in the final
composition.
If the camera is unable to focus using autofocus
(
0
72), focus lock can also be used to recompose the
photograph after focusing on another object at the same
distance as your original subject.
Focus lock is most effective
when an option other than
e
(
Auto-area AF
) is selected for AF-
area mode (
0
74).
1
Focus.
Position the subject in the selected focus point
and press the shutter-release button halfway to
initiate focus.
Check that the in-focus indicator (
I
)
appears in the viewfinder (viewfinder photography) or that
the focus point has turned green (live view).
Viewfinder photography
Live view
A
Autoexposure Lock
Pressing the
A
(
L
) button in Step 2 also locks exposure (
0
113).