Traditional Culture Encyclopedia - Photography major - What is the brightness value in the photographic parameters?

What is the brightness value in the photographic parameters?

Brightness refers to the brightness of the subject when taking pictures, which is expressed by EV value. The equivalent aperture of 0EV is F 1.0, the exposure shutter time is 1 sec, and ISO = 100. EV values below this brightness are negative. -9EV is very low brightness, which is the brightness when it is close to total darkness at night.