movement, from right to left (viewed from base side) 24 frames per second camera aperture: 70.41 by 52.63 mm (2.772 by 2.072 in) projection aperture: at least 2 mm (0.080 in) less than camera aperture on the vertical axis and at least 0.4 mm (0.016 in) less on the horizontal axis aspect ratio: 1.35:1 (camera), 1.43:1 (projected) Dynavision (8/70) (Also known as Iwerks 8/70) fisheye or spherical lenses, depending on if projecting for a dome or not vertical pulldown 24 or 30 frames per second camera aperture: 52.83 by 37.59 mm (2.080 by 1.480 in) See also List of film formats References https://web.archive.org/web/20080118094257/http://www.arri.de/prod/cam/technology_3_perforation.htm https://web.archive.org/web/20060713061542/http://www.aaton.com/products/film/35/3perf.php External links Movie Making Manual wikibook article on Telecine including a list of facilities that can telecine 2-perf Film and video technology