This has been an interest to me for a while and I've compiled a listing taken from several sources:
Code:
- - - - - - Standard Aspect Ratios - - - - - -
1 1 1.00 MF 6x6
7 6 1.16 MF Photo
6 5 1.20
5 4 1.25 Standard Photo
10" 8" 1.25 8R, 6P
24 19 1.26 LF 4x5 Frame
14" 11" 1.27 11R, Standard Photo
17 13 1.30
4 3 1.33 MF 6x4.5, Traditional TV
8" 6" 1.33 6R
4.67" 3.5" 1.33 LD, DSC
5.33" 4" 1.33 KGD
6.67" 5" 1.33 2LD, DSCW
15 11 1.36
11 8 1.37 Movie
7" 5" 1.40 5R, 2L, LF 5x7 Frame
3.5" 2.5" 1.40 2R
10 7 1.43
5" 3.5" 1.43 3R, L
13 9 1.44 IMAX
3 2 1.50 35mm Frame
6" 4" 1.50 4R, KG, Index Card
12" 8" 1.50 S8R, 6PW
5.25" 3.5" 1.50 LW
7.5" 5" 1.50 2LW
14 9 1.56 Advertising
8" 5" 1.60 Index Card
5 3 1.66 EU Movie
5" 3" 1.66 Index Card
35 20 1.75 1950's Wide
16 9 1.78 HDTV
37 20 1.85 US Movie
2 1 2.00 SuperScope/Red One
11 5 2.20 70mm Movie
47 20 2.35 CinemaScope
12 5 2.40 Wide Screen Movie
5 2 2.50
51 20 2.55 CinemaScope 55
13 5 2.60 Cinerama
133 50 2.66 Super 16 Movie
55 20 2.75 UltraPanavision
17 6 2.83 Pano Standard
3 1 3.00
4 1 4.00 Polyvision
34 5 6.80
This comes from listings for film photography, standard photographic print sizes and ratios, video, and cinematography. When a ratio is dependent upon a specific dimension, I have the values in inches.
I find that I commonly use 3:2, my dSLR's native ratio, and often I'll crop to 5:4, 24:19, and 17:6