This ND4-GR filter from Polar Pro is a key part of the expanded BaseCamp range. It is ideal for balancing the exposure of the sky and the ground during sunset and sunrise shooting. As with all Polar Pro products, you are guaranteed high-quality optics, materials, and overall construction. This specific filter has a stop reduction of 2 to 0 (clear), an optical density reading of 0.6 to 0 (clear), and a varied light transmission percentage of 25% to 99% (clear). Standing as a high-performance stage 3-type filter, it is ideal for freelance creatives, videographers, and up-and-coming production companies. Adding serious production-value to your documentary, short film, music video, and more.