HOYA 72UV 72mm Ultraviolet Filter for Camera Lens The human eye is sensitive to only a limited section of the light spectrum but most photographic films Where excessive UV (ultra-violet) light may occur, a blue haze may appear in your photos The UV filter is designed to help reduce this haze that is caused by blue and UV radiation An important filter for virtually all outdoor photo applications Note - The Skylight filter is very similar to the UV