1.33:1 = 4:3 tv iniziale
1.78:1 = 16/9 tv HD
1.85:1 = 37/20≈13/7
2.35:1 = 47/20≈7/3 CinemaScope 1953-1967
2:370:1 = 64/27 ≈ 21/9 21:9_aspect_ratio
2.40:1 = 48/20
Ultrawide_formats := aspect ratio more than 2
List_of_motion_picture_film_formats
Foto, film, schermi: dimensioni.xls