High-grade UV filter designed to withstand harsh weather conditions Constructed from Schott B270 glass for up to 99.4% light transmission Features a high-quality Aviation Aluminum ring with uniform surface gloss 3.1mm ultra-thin frame design with knurling for easy grip and no vignetting Dual-sided 24-layer coating for reduced reflection and increased light transmittance Waterproof and oil-proof coating for enhanced durability in challenging environments