(1) - cameras already do this. Photography 101 - if you use a small apature, everything is in focus (minus diffraction and motion blur). Cheap lenses (like most

(1) - cameras already do this. Photography 101 - if you use a small apature, everything is in focus (minus diffraction and motion blur). Cheap lenses (like most cellphones) have low apertures, and don't really need to focus. Expensive lenses (like the iPhone 4 lens) often have high apertures, which let you take faster photos, and artistically blur stuff. Photographers don't like to do this, as blurring the background draws your attention to the subject.