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In this particular photo I was trying to demonstrate having a shallow depth of field. You probably noticed that most of the picture is out of focus, well shallow depth of field is when your trying to focus on only a small part of the photo, i.e. the ripped part of the pocket. The best why to create a small depth of field is to use a large aperture. Aperture is the hole on your camera that controls how much light comes in, much like the iris in your eye controls how much light comes in.