Features: Light weight, portable, easy to carry. The filter can be used as a protective mirror for the lens. They don't affect color balance. Its multilayer coating prevents light reflection inside the glass and improves color reproduction. Filters can reduce ultraviolet light without affecting the transparency of visible light. It can reduce fog when shooting distant scenes in the hot sun. When using black and white film, the effect is particularly obvious, does not affect the exposure, but has a slight effect on the color temperature.