Putter Design to Adjust 9 Stops - Designed with a putter, K&F Concept variable ND filter can be adjusted by 9 stops from ND2 to ND400. Each stop is marked on frame conveniently for 360° rotated to adjust the stop, multi-scene application.

* Optical Glass Construction for Clarity - This ND filter is made of Japan-made top optical glass, effectively reduced reflection from the filter itself and glaring, ensuring a high-quality image and does not affect your images in any way.

* Nanotec Coating - Both glass sides of K&F Concept ND filter are multi-coated by the state of art Nanotec coating technology, so the filters are waterproof, oil-proof, and scratch-resistant, protecting your camera lens for an outdoor shooting.

* 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.