Haida Red Diamond Shockproof 150mm Reverse Grad ND0.9 Filter ND GND 150 x 170mm Double Strength Optical Glass MC 3 Stop ND8 HD4397 Double shock-proof strength over a normal glass filter Waterproof, oil and fingerprint proof and easy clean surface Ultra-thin Nano Multicoating that retains superb image sharpness as well as delivering true color with zero color cast R5 rounded corner design making insertion into the Filter holder much easier