With its impressive ability to slow down exposure time and increase the overall aperture, the LEE Filters 150 x 150 mm SW150 Super Stopper Neutral Density 4.5 Filter enables you to control the depth of field and convey movement in an easier way. It comes with a brilliant 32,000x filter factor that provides a 15-stop exposure reduction. The 4.5 density helps in the darkening of the entire image, thus allowing you to photograph with a slower shutter speed or a wider aperture than normally required. This filter is constructed from optical glass, which comes in handy for delivering an outstanding clarity and color fidelity.