A useful list of video aspect ratios

A reasonably complete list of common and usefull video aspect ratios. Ratio expressed as image width to height. Be aware that digital video often has non-square pixels, so a video may have two aspect ratios, a pixel aspect ratio and a display aspect ratio. The below table shows only display aspect ratios, the width to height of the final image after appropriate  stretching. Anamorphic lenses (lenses that squish an image horizontally), were and are often used to make wider images on the same amount of film. The same lens would be used on the projector to unsquish the image. This was a great idea when it came out, but now is purely a preference on the part of the director or producer.

ratio
aka
notes
1.33
4:3, full frame
older (SD) television, now mostly security video and other special methods
1.375
Academy ratio
movies from 1932 to 1952, now only artistic uses
1.43

most IMAX films
1.67
5:3, 15:9
some Disney animated movies, widescreen TV in Europe
1.78
16:9
widescreen television, most flat pannel displays, most newer consumer video cameras
1.85

many films, especially those not shot anamorphicly
1.89
17:9
GoPro 2.7k and 4k modes
2.20

70mm movies, a few big budget films from the last half of the 20th century and special venue films
2.35

anamorphic films, mostly older
2.39
2.40
anamorphic films, many modern films
2.76

ultra panavision 70, a few iconic films from the 1960's
> 2.76

special formats, special venues, never widely used