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 point in the final composition. If the camera is unable to focus using autofocus (0 107), 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
Position the subject in the 
selected focus point and press
the 
halfway to initiate focus. Check 
that the
N
Center of
105