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Exposure Calculator

Get the EV from aperture, shutter and ISO, plus the shutter that keeps the same exposure at every aperture

1/125, 0.008 and 2 all work

Exposure
EV 12
EV100 12
EV (settings)
12
EV100 (scene)
12
1 stop brighter
1/250
1 stop darker
1/1000
EV 11.9
Equivalent exposuresShutter speeds that keep the same EV at each aperture
  • f/1.41/2000
  • f/21/1000
  • f/2.81/500current
  • f/41/250
  • f/5.61/125
  • f/81/60
  • f/111/32
  • f/161/15
  • f/221/8

EV = log₂(N² / t) depends only on aperture and shutter; EV100 removes the ISO so it describes the scene instead (about 15 in sun, 5–8 indoors). Every row of the table has the same exposure as the current settings, so you can trade aperture against shutter.