The Benro SHDMND32K82 is a round ND filter ND32000 (4.5) with a diameter of 82 mm belonging to the Benro magnetic filter series. The ND32000 filter reduces the amount of light reaching the sensor by 15 f-stops. Its density of 4.5 makes the entire image extremely dark, allowing you to shoot at very long slower shutter speeds. The filter does not affect the colour of the image and can work with other filters. Anti-IR coatings - help block infrared and ultraviolet radiation that can cause poor image quality ULCA coating - reduces glare and significantly reduces chromatic aberration NANO WMC coating - multilayer colorless coating responsible for protection against scratches and external factors such as water, oil, dust - reduces the need for frequent filter cleaning The glass thickness of this filter is only 0.5 mm and can be used successfully with other magnetic filters without the risk of vignetting. Please note : This magnetic filter cannot be used alone. It needs to be used with a 82mm Magnetic Fixed Ring / Magnetic Step Down Ring to attach the magnetic filters onto the lens. If your lens is a different size thread, you may purchase 82-67mm / 82-77mm Magnetic Step Down Rings to suit other sizes of lens.