About this item: 1. Both sides of the lens adopt grinding and polishing technology to ensure ultra-high definition and image sharpness; 2. Unlimited ND3-1000, free gear shifting, very suitable for video dimming; 3. The lens is made of top Japanese optical glass, with double-sided multi-layer enhanced coating, which can effectively reduce the reflected light on the filter surface. Thus, the glare caused by the external defense line reflection of the long exposure lens is greatly reduced, and the first-class imaging quality is ensured. 4. The lens has 28 layers of nano coating on both sides, and multiple layers of waterproof and oil proof coating. If the water is accidentally splashed on the filter, the water drops will still remain solidified and will not spread, which is easy to carry and clean, and plays a role in fog prevention when stored for a long time. 5. Multilayer scratch resistant coating is applied on both sides of the lens to effectively prevent the risk of scratches on the lens surface; 6. The mirror frame is equipped with a push rod, which is convenient for customers to adjust the gear size; The utility model aims at helping users who take videos to automatically adjust the dimming gear through auxiliary tools; 7. The product is equipped with a storage bag, which is convenient for customers to store when shooting outside. The side pull structure follows the design style of the square piece storage bag and is easy to take out; 8. The frame is made of aviation grade aluminum. The frame is designed with ultra wide angle structure, which makes the frame thickness: 7.4mm. The design of thin frame ensures that the wide angle end of the 16mm end will not have dark corners; 9. The mirror frame surface is designed with CNC trapezoidal pattern to ensure that consumers can increase friction in a large area when rotating. Lens and other accessories can be installed/removed anytime and anywhere. 10. The surface shall be subject to oxidation sand blasting treatment, which can effectively avoid the entrance of stray light to a large extent, and is used to slow down the useless reflection of light except for the metal surface.