Slim Green Coating Hd Waterproof Anti Scratch Variable ND2-ND400 Filter Precision grinding and double-sided polishing ensures ultra-high-definition quality Thin frame design ensure no vignetting on 16mm wide-angle lens Oxidized sandblasted surface can effectively avoid stray light enteringCNC Non-Slip DesignFreely install and remove9 Stops AdjustableReduce exposure brightnessNanometer CoatingWaterproof, Oil-proof, scratch-proofAluminum Alloy Adjustment BuckleEnsure that there is no deviation when adjusting.