The Lee SW150 ND 0.6 Hard Filter is designed to reduce the exposure. The Hard ND filter has a hard transition from ND to clear glass. The filters are suitable for the Lee SW150 filter system. The size of the filter is 150x170mm. Why the LEE filter system is better than editing There is a reason why LEE Filters are not matched żeby other brands. Since its inception in 1978, the high-quality LEE Filters are hand made and checked by the best employees to meet the high-quality requirements. This rigorous process makes that the high-quality LEE filters set the standard for every other comparable filter system. This major judgment is without any doubt confirmed aby many photographers, both analogue and digital.