A technique of photography which permits all distance planes to remain clearly in focus, from close-up range to infinity.

A use of the camera lens and lighting that keeps both the close and distant planes being photographed in sharp focus.

Keeping images close by and far away in sharp focus simultaneously.

A technique in which objects in the foreground and the distant background appear in equally sharp focus.

The ability of a camera to focus equally on elements in the shot both very close to and a great distance away from the camera. This allows action to be photographed throughout the fore-, middle, and background of a frame, within the same shot.

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.