Photorepublik's 100mm ND filters are designed for larger "Z-series" filter holder systems. Graduated neutral density filters reduce the exposure of the sky, allowing you to balance out the exposure of your image, without affecting the rest of your image. Not only does this preserve the detail in your skies, but it also means you'll spend less time 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 hard edges, making it perfect for flat, even horizon lines such as oceans and lakes, or plains and deserts, and includes filters that block 1, 2, and 3 stops of light.