Technique No.3: Selective or Shallow Focus (Shallow Depth-of-Field) This technique is all about using the shallow Depth-of-Field of your zoom or telephoto EF lenses in conjunction with their maximum apertures to create a blurred background that immediately focus the attention to the subject whichever way a viewer may look at the pictures. Using selective focus to focus attention << Back to Main . 1 . 2 . 3 . 4 .