C-PRO is a high-performance professional PL filter that uses the highest quality SCHOTT glass material and features an extreme coating that provides ultra-low reflection to prevent adverse effects on captured images, as well as water and stain-repellent properties. This filter delivers extremely high optical performance in demanding environments such as landscape photography. ■ Optical performance with high transmittance achieved by extreme coating Surface reflection is minimized, maximizing lens performance. ■ Water and dirt are less likely to adhere, and even if they do, they can be easily wiped off. The glass surface can always be kept clear even in harsh environments. Extreme coating, ultra-low reflection 0.6% Extremely high water/stain repellent function Wide-angle compatible thin frame design with minimal vignetting due to precision machining Filter diameter: 67mm