The Nuances Extreme Reverse Grad ND8 allows up to 3 stops of light compensation with a soft transition from the middle of the filter where it is most dense and fades to the top, the reverse of a normal graduated filter. All Nuances Extreme filters are made from a new type of tempered optical glass that is 4 times stronger than the previous series. This means your new filters can travel with you into any extreme conditions and withstand those inevitable drops, nicks, and scratches that can happen to any photographer.