K F 67mm B Series Variable Nd2-400 Filter

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. Allows you to use slow shutter speeds to record the movement of objects such as waterfalls, and gives a silky-smooth flowing water effect