The depth of focus is the distance over which the focussed beam has about the same intensity, it is defined as the distance over which the focal spot size changes -5%~5%.
Depth of Field. This refers to the area, or depth, of the photograph that is in focus. You can control the depth of field by adjusting the aperture. If the picture is in focus for a large distance between the foreground and background, then the depth of field is higher. The greatest depth of field possible is called the Hyperfocal Point. These two pictures illustrate a great depth of field and a shallow depth of field. See also: Aperture | Hyperfocal Point
Depth of Field. The difference between the closest and farthest distances an object may be shifted before an unacceptable blur is observed at a particular resolution.
Depth of Field. The distance between the farthest and nearest points which are in focus. DOF varies according to numerous influencing factors such as lens focal length, aperture and shooting distance.
Depth of Field denotes the range of image in sharp focus as controlled by the aperture value chosen. Large apertures yield shallow depths; small apertures yield larger depths.
Depth of Field. The distance of acceptable sharpness that is in front of and behind a specific focus point. A larger aperture (lower f-stop number) results in a shallower DOF, rendering only a small amount of the scene in focus. This is useful in more artistic shots where a specific subject is to be emphasized against a distracting background. A smaller aperture (higher f-stop number) results in a wider DOF, resulting in much more of the scene being in focus.
DOF refers to the focus range, which is determined by how much the aperture is opened. A large aperture opening makes the DOF shallow, while a small opening makes it deeper.
Depth of field. The amount of distance between the nearest and farthest objects that appear in acceptably sharp focus in an image. Depth of field depends on the size of the aperture, the distance of the camera from the subject, and the focal length of the lens. The bigger the aperture, the greater the depth of field