The LEE Filters 150×150mm ProGlass IRND 1.2 Filter is specially designed to work with digital sensor cameras via an SW150-series filter holder. This filter allows you to step-down the shutter speed and increases the aperture opening in bright lighting to get control over the depth of field. The filter factor of 16× provides 4-stop exposure reduction without changing the original image coloration. It also reduces infrared light to control the color neutrality and minimize color cast caused by prolonged exposure times. The filter's optical glass design is resistant to scratches.