Film gauge
Film gauge is a physical property of photographic or motion picture film stock which defines its width. Traditionally, the major movie film gauges are 8 mm, 16 mm, 35 mm, and 65/70 mm. There have been other historic gauges in the past, especially in the silent era, most notably 9.5 mm film, as well as a panoply of others ranging from 3 mm to 75 mm.
