The NanoPro Magnetic Circular Polarizer Filter from Haida comes with an adapter ring that screws onto your lens. With the ring screwed on, you can then magnetically attach the polarizer filter and easily swap it out. | The adapter ring has both front and rear 52mm-82mm threads and accepts standard threaded as well as Haida magnetic lens caps on the front. It can be kept on your lens at all times. | This filter is constructed from optical glass for clarity and color fidelity.The Nano coating associated Circular Polarizer Filter provides an additional layer that results in an improved beading effect when the surface comes in contact with water or oil, allowing for more efficient cleaning. | The polarizer filter features glass optics with a top coating that protects against water, oil, dust, fingerprints, and scratches. Aluminum-alloy filter ring for durability while remaining lightweight,filter allow for use with other filters. | Please verify your camera's lens thread size before ordering. Your camera's lens thread size will be marked somewhere on the lens barrel or printed underneath your lens cap.If you have any questions about Haida products, you can contact us at any time