Lee SW150 ND Grad Hard Set 0.3 Neutral Density Hard Grad Reduces exposure by 1 stop without affecting colour balance. 0.6 Neutral Density Hard Grad Reduces exposure by 2 stops without affecting colour balance. 0.9 Neutral Density Hard Grad Reduces exposure by 3 stops without affecting colour balance. Looking for the right Lee Filter for you? Use Lee’s System Match tool to find what’s compatible with your equipment.