Exposure Done Right. The LEE 150 × 150mm SW150 Big Stopper 3.0 ND Filter is an ND filter with a 1,000x filter factor that provides a 10 stop exposure reduction. Its 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. By slowing your exposure time or increasing your aperture, you are able to control depth of field and convey movement more easily. Neutral density filters do not affect the coloration of the image and are ideal for pairing with other filters. The built-in gasket helps to prevent light from coming in between the filter and the lens behind it, which can have an unwanted effect on exposure

Built For Greatness. Curated from optical glass, this filter offers incredible clarity, does not affect coloration of the image, and is ideally used with other filters. The included metal filter case makes for easy & safe storage and transport, and is compatible with the LEE SW150 Mark II Filter System Holder for Wide-Angle Lenses to protect the filter while in use. This filter holder is available for rent separately.