The Rear Lens Clear Night Filter from Haida is designed to reduce light pollution in nighttime photography, allowing you to capture the beauty of the nighttime setting. The resulting images will have true-to-life colors and improved contrast when compared to images affected by light pollution. The adapter ring is required to use the clear night filter with the exception of the Sigma 14-24mm f/2.8 DG DN Art Lens for Sony E and Leica L. It is designed for the Canon EF 17-35mm f/2.8L USM, EF 17-40mm f/4L USM, EF 11-24mm f/4L USM, and EF 16-35mm f/2.8L USM.