This 95mm Magnetic Quick-Swap Neutral Density 3.0 Filter from Freewell is an ND filter with a 1000x filter factor that provides a 10-stop exposure reduction. The filter's 3.0 density darkens the entire image area without affecting the image's coloration, allowing the photograph to be made with a wider aperture or slower shutter speed than is usually required. Widening the aperture allows for finer control over depth-of-field to help isolate the image subject or increase bokeh. Slowing the exposure time increases blur and conveys movement more easily.