About This Item 1. Using AGC optical glass, double-sided 28-layer coating, which can effectively reduce the surface reflection of the filter. Reduces glare caused by external reflections from long-exposure lenses, ensuring top-notch image quality. 2. The lens is precisely ground and polished on both sides to ensure that the sharpness will not be affected on the telephoto lens and ensure high-definition imaging; 3. There are "mildew-proof", "waterproof", "scratch-proof" and "oil-proof" coatings on the lens surface. It will not have any impact on the image quality, even if it is contaminated with water droplets or oil, it can be easily removed and has the characteristics of hard scratching 4. ND2000 square filter, the size is square 100x100mm, the product weight is 47.5g, the lens thickness is 2mm, the applicable lens diameter is 82mm and below, and the light reduction is 11 stops (3.3). 5. The outer periphery of the filter bag is made of leather, and the inner lining is thin sponge, which plays a good role in protecting the filter.