The following values are standard stops in photography. Each stop is a value that measures the amount of light and double going in one direction and halve going in the other. The ratio of light measurement between all whole photographic settings is 2 to 1.
F-Stop (Aperture size from tiny opening to large opening)
f-64 f-45 f-32 f-22 f-16 f-11 f-8 f-5.6 f-4 f-2.8 f2 f-1.4
Shutter speeds from fast to slow
1/2000 1/1000 1/500 1/250 1/60 1/30 1/15 1/8 1/4 1/2 1 sec 2 sec
ISO (film speed from very fast/good in low light to slow/good in bright light)
6400 3200 1600 800 400 200 100 50 25 12
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