High-quality UV protective filter designed for optimal lens protection in harsh environments Constructed from durable Schott B270 glass with light transmission up to 99.4% Frame crafted from high-quality aviation aluminum with a uniform surface gloss Ultra-thin 3.1mm frame design with knurling for easy grip and zero vignetting Features 24 layers of coating to reduce reflection and enhance light transmittance Double-sided waterproof and oil-proof protection for superior resilience in challenging conditions