Zomei&reg; Density Neutral Graduated Gray Square Z-PRO Series Filter - 143mm x 100mm Compatible with Cokin Z-PRO Series, need to work with Z Series holder and adapter ring. Recommended for: SLR or Full Frame or APS-C D-SLR cameras with wide-angle lens from 72mm. Graduated filters can help you to re-establish the balance between colours and reduce contrast between the different parts of your image. Colour the skies according to your inspiration. Create or enhance sunsets.