PolarPro QuartzLine 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 fit smoothly and are built to withstand your toughest adventures. With optical coatings for a hyper-neutral color profile, nearly perfect target transmission, and multiple 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 around the world. Features: - Weight optimization for X7/X5 - Optimal balance with all lenses (8.2g) - 46mm thread - compatible with Inspire 2 - X7 / X5s / X5 cameras - Quartz glass element - Resolves up to 100MP sensors - High color neutrality - Consistent color across the entire line - 16 coatings - Scratch-resistant / oil-resistant / hydrophobic coatings.