Nikon D3100 (18-55mm Kit) 사용자 설명서

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Focus Point Selection
In manual focus mode or when autofocus is combined with AF-area modes other 
than 
e (Auto-area AF), you can choose from 11 focus points, making it possible to 
compose photographs with the main subject almost anywhere in the frame. 
1
Choose an AF-area mode other than 
e 
(Auto-area AF; 
0
58
)
.
2
Select the focus point.
Use the multi selector to select the focus point in 
the viewfinder or information display while the 
exposure meters are on. Press 
J to select the 
center focus point.
Focus Lock
Focus lock can be used to change the composition after focusing in AF-A, AF-S, and 
AF-C focus modes (
0 55), 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 56), you can also focus on another subject at the same distance and 
then use focus lock to recompose the photograph. Focus lock is most effective when 
an option other than 
e (Auto-area AF) is selected for AF-area mode (0 58).
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.
Focus point