Depth of Field Pt. 1
Depth of field is like a block of sharpness which extends into your photo. You might need a big deep depth of field for something like a landscape, or maybe a small shallow one for a portrait with a soft fuzzy background.
Aperture size is the main depth of field control - but focal length and how far away you are from the spot you've locked your autofocus onto also makes a difference. As you adjust depth of field with your aperture you must be careful to avoid camera shake - which can happen when you set a small aperture.
In this video exercise we'll work with a wide or short lens because different focal length lenses have different depth of field characteristics. A short lens has lots of DOF. In depth of field part 2 well do it with a long lens which is much better for fuzzy backgrounds because they have a much shallower depth of field.