Deep focus is a photographic and cinematographic technique using a large depth of field. Depth of field is the front-to-back range of focus in an image — that is, how much of it appears sharp and clear. In deep focus the foreground, middle-ground and background are all in focus. Deep focus is normally achieved by choosing a small aperture. The aperture of a camera determines how much light enters through the lens, so achieving deep focus requires a bright scene or long exposure. Wide angle lenses also make a larger portion of the image appear sharp.
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