Find the exposure value (EV) for a given aperture, shutter speed and ISO.
Exposure value combines aperture and shutter into one number, higher meaning a brighter scene or a lighter exposure. EV offers a shorthand for light levels and lets you reason about exposure without juggling three separate settings.
Exposure Value (EV)
EV = log2(N^2 / t); normalize with log2(ISO/100)
EV = log2(N^2 / t); normalize with log2(ISO/100) Exposure value combines aperture and shutter into one number, higher meaning a brighter scene or a lighter exposure.
EV offers a shorthand for light levels and lets you reason about exposure without juggling three separate settings.
This calculator takes 3 inputs: Aperture (f-number), Shutter speed (1/x s), ISO. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.