Refers to the size of the area on the artwork which falls within the sight of the camera. Thus, a 12 field is roughly 12 inches across and a 9 field is 9 inches across. Even though a drawing or cel may be of a standard 12 or 16 field size, the camera may have been zoomed in to a 8 or 9 field, focusing on a tighter area of the artwork, eliminating the outer margins of the sheet. Most early pictures conformed to a squarish rectangular field referred to as the Academy Format. Later films, which were shot in widescreen or Cinemascope had a more rectangular active area.