Photorepublik's 100mm ND filters are designed for larger "Z-series"filter holder systems. Graduated neutral density filters reduce theexposure of the sky, allowing you to balance out the exposure of yourimage, without affecting the rest of your image. Not only does thispreserve the detail in your skies, but it also means you'll spend lesstime on corrections in post-production. Because these filters are neutral,they will not affect the colour of your image like some other filters.This filter set features soft edges, making it perfect for uneven horizonlines such as forests and mountains, and has filters that block 1, 2, and 3 stops of light.