Rodenstock Digital Vario ND 2- ND 400 MC with a large range of density.If you need more than 2x, 4x and 8x you can use a Variable ND filter and achieve finer graduation.The range is from 1.5 stops to 5 stops (2.8x to 32x) without colour cast. Above that the filter will not be totally neutral. Please note that when using very wide angle lenses shading will occur above 7 stops (128x) .It is for these reasons that the markings on the filter will only show +1.5 to +5. Best optical glass- scratch resistant-rugged slim ring with front thread. Keep updated on Rodenstock filters news on our knowledgebank.