PolarPro Quartz Line Filters are made from 99.9% pure quartz glass for long-lasting durability and optical clarity. These single-element quartz glass filters produce a very low refractive index of 1.46 and offer excellent temperature stability. The redesigned brass filter frames thread in smoothly and are built to withstand your toughest adventures. With optical coatings for a hyper-neutral color profile, nearly perfect target transmission, and multi-coatings for enhanced scratch resistance, water resistance, anti-reflective properties, and reduced vignetting in wide-angle shots, the QuartzLine filters enable content creators to bring lifelike colors to their final product, even in the most extreme locations in the world. Features: - Weight optimization for X7/X5 - Optimal balance with all lenses (8.2 g) - 46 mm thread - compatible with Inspire 2 - X7 / X5s / X5 cameras - Quartz glass element - Resolves up to 100 MP - High color neutrality - Consistent color across the entire line - 16 coatings - Scratch-resistant / oil-resistant / hydrophobic coatings.