Hoya HD3 Professional UV Filter 52mm NEW and IMPROVED ultra-smooth nano-coating is 800% harder for ultimate protection and cleaning NEW 32-Layer Ultra-Hard Nano Multi-Coating process creates the sharpest consumer UV filter available Chemically enhanced UV optical glass is 4x stronger than normal optical glass NEW Multi-coating technology yields 99.7% light transmission and is extremely scratch & stain resistant and water & oil repellent Lifetime Limited Warranty when purchased from a USA Authorized Retailer