This Protection Filter features ultra-hardened glass and Repellemax II coating for ultimate lens protection. It passes 99.2% of light to your camera for excellent images in tough conditions. Crafted for fine lenses, HGX Prime filters are individually ground, polished, and coated. They repel dirt and transmit brilliant light to achieve the clearest possible image. Protective: Repellemax II Anti-static barrier resists dust, dirt, oil, water and fingerprints Best Image: Cutting-edge multi-coatings and black rimmed glass pass the clearest light to your sensor Strong and Durable: Ultra hardened glass with scratch resistant coating Bright: Extremely high visible light transmission to your camera Thread size: 37 mm Outer diameter: 39 mm Frame thickness: 6.0 mm Lens thickness: 1.3 mm Coatings: 22 layers Light transmission rate: 99.2% (average at 400 - 700 nm) Reflection: less than 0.3% (average at 420 - 680 nm) Made in Japan