Thanks everyone on your comments about my question about FOCUS using an 85mm 1.8 with a D700. I now understand that if my subject is slightly out of focus... i.e. one half of the face, or the shirt, etc... then I should increase the F stop. What I don't understand is that if I go to an F stop of lets say 5.6 or more, aren't I defeating the purpose of the 1.8 lens... i.e. won't the background come into focus the higher my F stop?