A focusing scale is a measurement indicator on a camera lens that shows the distance from the film plane or digital sensor to the subject. It is usually marked in both feet and meters, allowing photographers to set focus accurately without relying solely on the viewfinder.
Focusing scales are especially useful in manual focus photography, including landscape, macro, and studio work, where precise distance measurement helps achieve sharpness. They also assist in techniques such as zone focusing and hyperfocal distance, enabling photographers to plan depth of field and maintain critical focus across a scene.