SUPERIOR IMAGE QUALITY - Crafted from H-K9L optical glass with nano coating, this filter ensures exceptional clarity and prevents image degradation for professional-grade results. OPTIMIZED LIGHT TRANSMISSION - Achieve perfect exposure with a 3-stop (0.9) density, ideal for balancing bright skies and darker landscapes, enhancing dynamic range in your photos. ENHANCED DURABILITY - Featuring dual-sided nano coating technology, this filter is waterproof and scratch-resistant, ensuring reliable performance in challenging outdoor conditions. DESIGNED FOR LANDSCAPE - Specifically engineered for landscape photographers using Nisi 180mm filter holders, this reverse graduated ND filter is perfect for capturing stunning sunsets.