How does the camera arrange the halo?

The lens of a camera is usually designed and processed to prevent the occurrence of halo, so as not to affect the imaging quality. However, when the strong point light source directly shoots at the lens, it will produce halo effect and interfere with the normal work of the camera metering system. Usually, it is necessary to increase the exposure by 2~4 levels according to the strength of the point light source to have the required shooting effect.