High-quality 100x150mm Reverse-Graduated ND 0.6 Filter (2 Stops) by Lee Filters Specifically designed for optimal exposure control during sunrise and sunset photography Features a unique density gradient, strongest at the horizon line for balanced sky exposure Ideal for use with lenses of 24mm or wider on a full-frame DSLR or equivalent Handcrafted by skilled technicians for unparalleled precision and quality control Provides a smoother, more gradual transition between dyed and clear areas for a pleasing image balance