SHELL FILM UNIT STOCK SHOT LIBRARY

When a film is being made a much greater footage of material is exposed than is required for the final production. The ratio varies from four to one to fifteen or twenty to one. The former would apply to a rigidly scripted film where each shot can be exactly specified and prearranged, the latter to a film where the action is unpredictable and cannot be planned, as, for example, in filming racing of any kind.