EV links aperture and shutter speed: every combination with the same EV gives the same exposure. Use it to switch settings without re-metering.
It also estimates scene brightness in lux, so you can compare with a light meter app.
Formula
EV₁₀₀ = log₂(N² ÷ t). At a higher ISO the same scene needs log₂(ISO ÷ 100) fewer EV. Typical values: EV 15 sunny day, EV 12 sunset, EV −2 to −6 moonlit landscapes.
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