To compose photographs with o -center subjects:
Position the subject in the focus frame.
Press the shutter button halfway to set focus
and exposure. Focus and exposure remain
locked while the shutter button is pressed
halfway (AF/AE lock; note that if exposure is
currently locked using the AE/AF LOCK button
as described on page 36, pressing the shut-
ter button halfway locks only focus).
Repeat steps 1 and 2 as desired to refocus
before taking the picture.
Recompose the picture.
Keeping the shutter button pressed halfway,
recompose the picture.
Press the shutter button the rest of the way
down to take the picture.
Press the rest of the way down