Sometimes black plates or black cloth are used in photography. This thing is called a visor or a shade cloth in photography. Used to block unnecessary or too strong light and natural light, because too strong light will overflow the surface of the subject when shooting. If you cover it with black board or cloth, the light will become soft and natural, and the photos taken will be more natural and comfortable. In practical application, the shading board is used more, but the cloth is used less. The board is very convenient to use, and one person can shade the sun. It takes several people to pull the cloth, but it is more convenient to hold the cloth than to hold the board. Ha ha, simple words are complicated-