K&F Concept Magnetic ND2-ND32 Filter Variable Neutral Density Filter Without Black "X" Cross With 28 Layer Coatings (Nano-X) About this item: 1. The biggest selling point of the magnetic filter is "quick installation and removal". Unlike the threaded filter, it needs to be rotated; the magnetic filter can be installed in one second, and the threaded filter needs at least 6 seconds. 2. There are five scale values from Min to Max on the periphery of the product frame. The black frame is matched with white characters, which is very eye-catching. It is worth mentioning that this product has frame self-locking technology. When it is rotated to the Min (ND2) end or Max (ND32), the frame is automatically locked, which is convenient for light reduction and positioning. Avoid the phenomenon of black cross 3. The lens adopts a double-sided polishing process, and when used on a telephoto lens, the photos are still clear, high fidelity, and restore the true color of things; 4. 28 layers of nano-coating with anti-reflection green film, which can effectively reduce the reflection of the filter surface while filtering ultraviolet rays, greatly improve the light transmittance and balance the color; 5. Multi-layer nano-coating, dust-proof, waterproof, anti-fouling and anti-scratch, protect the lens; 6. The ultra-thin frame design can effectively prevent vignetting when the wide-angle lens is used. The frame is CNC machined, and the appearance is rich in layers; 7. Equipped with a magnetic adapter ring for easy installation of other magnetic filters.