The lee sw150 neutral density 09 soft graduated resin filter reduces exposure by three stops without effecting colour balance the nd soft grad offers a soft transition from dark to light and allows you to create the perfect shot by controlling your light source nd grads are an essential tool in modern landscape photography on both digital and film cameras the lee sw150 nd grad filters measure 150 x 170 mm and are for use with the lee sw 150 filter holder not included available separately