Before ISO, there is many other film speed system
ISO | cam 2009- | ASA (1960-1987) | DIN (1961-2002) | GOST (1951-1986) | apex (1960) |
25 | 25 | 15 | 22 | 3 | |
32 | 32 | 16 | 32 | ||
50 | 50 | 18 | 45 | 4 | |
64 | 64 | 19 | 65 | ||
100 | 100 | 21 | 90 | 5 | |
200 | 200 | 24 | 180 | 6 | |
400 | 400 | 27 | 350 | 7 | |
800 | 800 | 30 | 700 | 8 | |
1600 | 1600 | 33 | 1400 | 9 | |
3200 | 3200 | 36 | 2800 | 10 | |
6400 | 6400 | 39 | 5600 | 11 | |
12500 | 12800 | 12500 | 12 | ||
25000 | 25600 | 13 | |||
50000 | 51200 | 14 | |||
100000 | 102400 | 15 | |||
200000 | 204800 | 16 | |||
400000 | 409600 | 17 |