【Import Optical Glass】This ND filter is made by importing Japanese AGC optical glass, a total of 28 multi-layer coatings, effectivly reducing reflection from the filter itself and glarings, ensuring high-quality image. | 【Putter Adjustable Design】Frame designed as a putter can help you accurately adjust the stop, for video shooting users can automatically adjust the stop via auxiliary tools, each stop from ND3 to ND1000 be marked on the frame conveniently for 360-degree rotation to adjust the stop, multi-scene application. | 【Waterproof & Scratch Resistant】Both glass sides of the variable nd lens filter with multi-layer hydrophobic, oil-proof, and scratch-resistant coating, protecting the nd filter from all round, suitable for adventure use. | 【No Vignetting】The filter designed with an ultra-wide-angle design, the ultra-slim frame is only 7.4mm, supporting in 16mm telephoto and wide-angle lens no vignetting, due to the difference in lens type and focal length so this filter might be met dark "X" cross, this isn't the quality problem, it can disappear via rotating the filter. | 【Compatibility Note】This ND filter suits all 49mm lenses. Check your camera's lens thread size (usually beside a "ø" diameter symbol) before ordering. Additionally, a 52mm lens cap is required for this 49mm variable ND filter.