Definitions for "Depth of Focus"
Keywords:  focus, focused, lens, plane, sharp
The distance along the optical axis through which an image can be clearly focused.
The space including the focal plane of the lens through which the film can be moved closer or farther away from the lens, and still produce a reasonably sharp image.
The range through which a photographic film or plate can be moved forward and backward with respect to the lens while retaining satisfactory sharp focus on an object at a given distance.