Drop-In ND65000 filter with 16-stop reduction in light transmission to lengthen your exposure timeReduce Shutter Speeds, Widen AperturesFits 100mm K-Series KH-100 Filter Holder onlyMade from high quality German Schott B270 GlassLengthen exposure durations to blur movement, create tranquil scenes of smoothed water. Remove moving pedestrians and cars from street scenes by turning them to a blur