The Hoya 40.5mm Fusion One Next UV Filter features a multi-layer coating comprising 18 layers, ultra-high light transmission, high-quality optical glass and an unobtrusive, thin aluminium frame. In addition, this new filter collection has a stain-resistant and water-repellent coating. This makes this filter ideal for both amateur and professional photographers. The UV filter reduces cast and corrects blue and violet. In addition, the anti-reflective coating prevents unwanted reflections in your footage. Moreover, UV filters are often used to prevent damage to the front lens. Features of the Hoya 40.5mm Fusion One Next UV Filter UV filter High-quality, professional-grade optical glass Stain resistant and water-repellent Reduces cast and corrects blue and violet Features an 18-layer coating Protects your front lens For more Hoya products see here.