【Flexible Exposure Control】 This variable ND2-400 filter offers limited 1-9 stops of light reduction. Rotate it to precise stops for desired ND values and perfectly exposed pictures. Note: A dark X pattern may appear at maximum aperture. This normal phenomenon occurs when the variable ND filter, with its two polarizing filters aligned at a specific angle, interacts with certain lenses and focal lengths 【Precise ND Value Adjustment】 Precise markings enable you to achieve desired neutral density values effortlessly and accurately through rotation 【Multicoated Optical Glass】 Optical glass ensures high clarity and accurate color reproduction. Multiple coatings on both sides of the glass are resistant to water, fingerprints, smudge, and scratches, making filters easy to clean (a cleaning cloth is included) 【Slim Aluminum Alloy Frame】 Crafted with black anodized aluminum alloy for exceptional durability, the slim frame also avoids unwanted vignettes on wide angle lenses. CNC precision threading ensures effortless installation and removal 【Confirm Filter Compatibility】 Suitable for any camera lens with a filter size of 58mm. The filter size is marked on the front or side of your lens, next to a "ø" (diameter) symbol. Please confirm before purchasing