exposurevalue
Exposure value (EV) is a unit used in photography to express a set of shutter speed, aperture, and ISO combinations that yield the same exposure on the image sensor. It provides a convenient, logarithmic scale for comparing or selecting exposure settings.
At ISO 100, EV is defined by the formula EV = log2(N^2 / t), where N is the f-number
Usage and interpretation: EV is widely used in light metering and exposure planning. Many cameras report EV
Limitations and notes: EV is defined relative to ISO 100, and real-world brightness interacts with ISO, sensor