Ultra Panavision 70 lenses that used a high quality cylindrical anamorphic element in front of the objective lens. These new lenses were far superior to the prism anamorphics—they were lighter, transmitted more light and suffered from less spherical and chromatic aberration. 1.25x squeeze factor, projected aspect ratio 2.76:1 Showscan Same as Standard 65 mm except 60 frames per second 180 degree shutter IMAX (15/70) spherical lenses 70 mm film, 15 perforations per frame horizontal rolling loop movement, from right to left (viewed from emulsion side) 24 frames per second camera aperture: projection aperture: at least less than camera aperture on the vertical axis and at least less on the horizontal axis aspect ratio: 1.43:1 IMAX Dome / OMNIMAX Same as IMAX except fisheye lens lens optically centered above film horizontal center line projected elliptically on a dome screen, 20° below and 110° above perfectly centered viewers Omnivision Cinema 180 same as standard 65/70 except: photographed and projected with special fisheye lenses matched to large 180 degree dome screen Theatres upgraded from 70 mm 6-track analog sound to DTS digital sound in 1995. Omnivision started in Sarasota, Florida. Theatres were designed to compete with Omnimax but with much lower startup and operating costs. Most theatres were built in fabric domed structures designed by Seaman Corporation. The last known OmniVision theatres to exist in USA are The Alaska Experience Theatre in Anchorage, Alaska, built in 1981 (closed in 2007, reopened in 2008), and the Hawaii Experience Theatre in Lahaina, Hawaii (closed in 2004). Rainbow's End (Theme Park) in NZ had the only remaining permanent Cinema 180 attraction until May 2015 when it was demolished. One of the few producers of 70 mm films for Cinema 180 was the German company Cinevision (today AKPservices GmbH, Paderborn). Dynavision (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) Astrovision (10/70) vertical pulldown normally printed from an Omnimax negative projected onto a dome almost exclusively in use only by Japanese planetariums the only 70 mm format without sound, hence the only one with perforations next to the edges See also 70 mm Grandeur film Cine 160 Cinerama Dolby Stereo 70 mm Six Track Super Panavision 70 Super Technirama 70 Todd-AO Ultra Panavision 70 List of film formats List of early wide-gauge films List