Deep focus is a photographic and cinematographic technique incorporating 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. Consequently, in deep focus the foreground, middle-ground and background are all in focus. This can be achieved through knowledgeable application of the hyperfocal distance of the camera lens being used.Deep focus is achieved with large amounts of light and small aperture. It is also possible to achieve the illusion of deep focus with optical tricks or composite two pictures together. It is the aperture of a camera lens that determines the depth of field. Wide angle lenses also make a larger portion of the image appear sharp. The aperture of a camera determines how much light enters through the lens, so achieving deep focus requires a bright mise en scene. Aperture is measured in F-stops with a higher value indicating a smaller aperture.Diagram of decreasing apertures, that is, increasing f-numbers, in one-stop increments; each aperture has half the light gathering area of the previous one.

Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.