What does EV mean in a dash cam?

[ORylee]

EV in a dash cam is a set standard used to measure whether the amount of light passing through the lens meets the required level. The amount of light passing through the lens is primarily determined by the area of passage and the cumulative time of passage. Since both aperture and speed are variable, there can be many combinations of results. The EV value is the result of comparing the luminous flux with a set numerical value. When the difference between the luminous flux and the set value is zero, the EV value is zero. A dash cam is an instrument that records images, sounds, and other related information during vehicle travel. After installing a dash cam, it can record the entire process of the car's journey in video and audio, providing evidence for traffic accidents.