When you take photos with your mobile phone at night, there will always be such a long beam of light when you encounter light. What's the problem?

This is a glare phenomenon, which is formed by the image reflected by the camera and the image captured by the image sensor. It belongs to pure hardware characteristics, and it is inevitable for the camera to shoot with strong light source.

Glare can also appear when the camera is dirty. Please clean the camera before taking pictures.

Data expansion:

So why is there glare? This should start with the optical structure of the lens. Lenses are generally composed of multiple lenses, and each lens has two reflecting surfaces. A lens will have more than ten reflecting surfaces, and the lens surface will reflect about 5% of the incident light. The more reflective surfaces there are, the more times the light will be reflected and diffused after entering the lens, so the more complicated the lens is, the more the image quality will be affected. Especially when shooting with backlight or side backlight, high-intensity light source enters the lens, which makes multiple reflection surfaces interfere with each other and easily forms glare.