Crafted for fine lenses, HGX Prime IRND filters are individually ground, polished, and coated. They repel dirt and suppress infrared light to achieve the best possible image. Protective: Repellamax II Anti-static barrier resists dust, dirt, oil, water and fingerprints Best Image: Finely tuned visible light transmission with truly neutral color create the image you expect to see Strong and Durable: Ultra hardened glass with scratch resistant coating This 100 x 100mm square filter works with many modular filter holder systems. It has rounded corners for safety. A soft, protective case is included which uses a quiet magnetic closure, perfect for storing the filter and stealthily removing it when needed. Dimensions: 100mm x 100mm Thickness: 2mm Light reduction: 12 stops Optical Density: 3.6 Filter Factor: 4000X Made in Japan