Sirui SUUV82A 82mm Aluminum Ultra Slim UV Lens Filter

The Sirui SUUV82A is an 82mm UV protective filter constructed from German Schott B270 plate glass — a material specification worth noting because B270 is an optical-grade white glass with tightly controlled refractive index consistency and minimal inherent color tint, unlike the greenish cast common in lower-grade filter glass. The 22-layer nano multi-layer anti-reflective coating applied to both surfaces reduces light reflection per surface to under 0.2%, which means the filter introduces negligible flare and ghosting even in scenes with direct light sources in or near the frame. At 3.4mm total thickness the aluminum frame is classified as ultra-slim — an engineering decision that directly addresses the vignetting issue that plagues full-profile filter rings on wide-angle lenses with large front elements.

This filter is built for the landscape and outdoor photographer who keeps a UV filter on every lens as standard practice and refuses to accept optical penalties for doing so. The 99.8% UV cut-off rate is the practical field benefit in high-altitude alpine work, coastal shooting, and snow environments where UV scatter produces that distinctive blue haze in shadow areas of RAW files. The oil-resistant and anti-static coatings reduce how frequently cleaning is required — important for photographers who can't pause for maintenance between shots. The aircraft-grade aluminum ring handles temperature extremes without the warping or ring-seize issues that softer filter rings develop after cycling between cold and warm environments repeatedly.