It's a high-quality, durable 77mm Multi-Layer Nano Coating Uv Filter from the renowned Hasselblad brand, designed to effectively block the majority of Uv light, thereby minimizing its impact on your photography. This professional-grade filter meets and exceeds Hasselblad's rigorous optical standards and high-quality requirements, making it an ideal companion for Hasselblad lenses and a valuable addition to any creative toolkit. Crafted from premium Schott B 270 glass, this reliable filter features a double-sided 30-layer low-reflective optical coating, ensuring an impressive average light transmission of over 98.5%. This feature effectively reduces lens flare and guarantees crystal clear images, even when shooting in challenging light conditions. The Hasselblad Uv Filter boasts a broad Uv cutoff range of 300nm to 410nm, effectively eliminating blue and purple flares to deliver accurate and faithful color reproduction.