K F 72mm B Series Variable Nd2-400 Filter

K&F 72mm B Series Variable ND2-400 Filter. Key Features: Made of Optical Glass Designed for Canon & Nikon DSLRs 9 Stops Adjustable Light Reduction Effect Reduces the amount of light entering the lens, thus decreasing camera shutter speed. Useful for situations where motion blur needs to be created (rivers, waterfalls, moving people) or large apertures must be used with flash to avoid overexposure.