When with backlit, side light, or flashlight, it can the entry of non imaging light and avoid fog The use of Lens hood does not affect the use of various in front of the lens Special model, no dark corners will be generated Shielding the side interference light source, reducing and enhancing photo color and saturation When taking forward and side light photography, it is possible to avoid surrounding scattered light from entering the lens During lighting photography or nighttime photography, it is possible to avoid surrounding interference light entering the lens