Well. One use would be to experiment with different focuses and pick the best later. It is not a rarity for me to look at old pictures and think that a differen

Well. One use would be to experiment with different focuses and pick the best later. It is not a rarity for me to look at old pictures and think that a different focus would have worked better (Then again I am no great photographer. For all I know others are never feel this need. So take that with a pinch of salt)