What is the median gray level? Looks like photography.

The medium gray value refers to the density value of the medium gray density mirror.

1, another name of the medium gray-scale mirror is neutral gray-scale mirror. Its main function is to prevent overexposure, filter light when shooting, and filter evenly when filtering. There is no selectivity, but it only weakens light and does not affect the color of the subject.

2. This density mirror has a variety of densities to choose from, and can also be used in combination with multiple lenses.