Reference common exposure values (EV) for typical lighting scenes and map them to aperture, shutter speed and ISO combinations.
EV 越低画面越亮。
| Item | Formula / Rule | Source / Standard |
|---|---|---|
| Base definition | EV = log2(N² / t), which describes the exposure pair independent of scene luminance | ISO 2720:1974 General-purpose photographic exposure meters |
| With sensitivity | EVS = log2(N² / t) − log2(S / 100) | ISO 2720:1974 §3 exposure value definition |
| Typical scenes | Sunny front light sits near EV 15, overcast near EV 12 and indoor lighting around EV 5 to 7 | ISO 2720:1974 Annex A exposure tables |
摄影参数、曝光与画质的快速参考。