ZOMEi 100mm Neutral Density ND2+ND4+ND8 Filter Kit + Holder + 72mm Ring for Cokin Z 1.Neutral density filters are precious tools for all lovers of landscape photography, for both artists and technical experts. 2.Compatible with Cokin Z-PRO Series, need to work with Z Series holder and adapter ring. 3.Recommended for:SLR or Full Frame or APS-C D-SLR cameras with wide-angle lens. 4.Neutral density filters can help you to re-establish the balance between colors and reduce contrast between the different parts of your image. 5.Color the skies according to your inspiration.