【Imported Optical Glass】Crafted from premium AGC optical glass with 8 multi-layer coatings, this ND filter reduces reflections and glare for superior image quality. 【Versatile Light Control】Featuring 1 to 9 stops of adjustable light reduction and 360-degree rotation for precise dimming, this filter is perfect for various scenarios. (Note: Maximum stops may cause a cross-pattern effect, commonly known as an "X black cross." This phenomenon is natural and temporary, occurring due to the adjustable ND filter's interaction with specific lenses and focal lengths.) 【Anti-Glare Surface】Treated with an oxidized sandblasting process, this filter prevents unwanted stray light and minimizes unnecessary reflections on its metallic surface. 【Slim & Secure】With a thickness of only 7.4mm, the CNC-patterned design ensures enhanced friction during rotation, making it easy to attach/detach lenses and accessories anytime, anywhere. 【Compatibility Note】This ND filter fits all 40.5mm lenses. Please check your camera's lens thread size (usually next to a diameter symbol "ø") before ordering. Additionally, a 43mm lens cap is required for this 40.5mm variable ND filter.