【Import Optical Glass】This ND filter made by import Japanese AGC optical glass, total 28 multi-layer coatings, effectivly reduces reflection from filter itself and glaring , ensuring high quality image. | 【Putter Design】This filter frame designed a putter can help you accurately adjust the stop, for video shooting user can automatically adjust the stop via auxiliary tools, each stop from ND2 to ND400 be marked on frame conveniently for 360 degree rotated to adjust the stop, multi-scene application. | 【Hydrophobic & Scratch Resistant】 Both glass sides of K&F Concpet ND filter with multi-layer hydrophobic, oil-proof and scratch resistant coating, protecting the nd filter from all round, suitable for adventure using. | 【No Vignetting & Dark Corner】For the filter designed with ultra wide-angle design, the ultra slim frame only 7.4mm, supporting in 16mm telephoto and wide angle lens no vignetting , due to the different in lens type and focal length so this filter might be met dark"X" cross , this isn't quality problem , it can disappear via rotating the filter. | 【Note】This nd filter is compatible with all 55mm lenses. 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. This number is always preceded by a "ø" (diameter) symbol.