1 Second Install & Swap This variable ND8-ND128 filter with magnetic technology, install the filter adapter ring on the lens first, the filter can be adsorbed in 1 second, faster installation than traditional thread filter (6s). No Black "X" K&F Concept utilizes cutting-edge technology (frame self-lock) to avoid the common "X" cross on a wide-angle and telephoto lens. 28 Multi-Layer Coatings Both sides of the glass with nanometer coating (a total of 28 layers) are waterproof, scratch-resistant, and anti-glaring, effectively protecting the camera lens. Magnetic Adapter Rings The adapter ring has a thread to be screwed onto the lens. The ND8-ND128 magnetic filters engage in a magnetic way. Magnetic Adapter Rings also suitable for other magnetic filters such as the Magnetic CPL, Magnetic ND8, Magnetic black mist and the Magnetic ND1000 by K&F Concept.