Exposure Value (EV)
standard power-of-2 exposure step
Apature:
1 1.4 2 2.8 4 5.6 8 11 16 22 32 45
Shutter Speed:
60 30 15 8 4 2 1 1/2 1/4 1/8 1/15 1/30 1/60 1/125 1/250 1/500 1/1000 1/2000 1/4000 1/8000
ISO:
50 100 200 400 800 1600 3200 6400 12800 25600 51200 102400
