10-Stop Neutral Density Filter Increase Exposure Length Helps to Convey Movement High Quality Optical Glass Compatible with 100mm Filter Holder The LEE Filters 100 x 100mm Big Stopper 3.0 Neutral Density Filter is a solid neutral density filter providing a 10-stop reduction in exposure. This 3.0 density creates a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required.