77 mm filter thread fits lenses with 77 mm front elementWater-white optical glass accurate colours & high clarity~99.3% light transmittance minimal light loss18-layer Ultra Hard Coating high scratch resistanceDouble-sided nano coating waterproof, oil-proof, easy to cleanUltra-slim aluminium frame (~3.5 mm) reduces vignetting on wide-angle lensesKnurled edge frame easy mounting/unmountingIncludes protective case & cleaning cloth ready for field use