* 【Material】 ND Filter: Made by Completed Professional Optical Glasses instead of Optical Resin. filter reduces the intake of light without affecting the overall color balance.For this 37mm ND filter，the lens cap/hood should be 40.5mm. Because of the update of the product's package, the new and the old version will be sent randomly.
* 【No “X” cross on images】Say goodbye to the "X" cross on images, K&F utilize cutting edge technology you're going to say goodbye to this common issue with wide angle lenses and variable ND filters.
* 【NANOTEC】Our optical engineers developed new Nano coating layer technology， Waterproof, scratch-resistant, anti-reflective green coating, effectively prevent from oil, fingerprint, scratch, protect valued lens.
* 【Professional Design】Ultra slim rim design preventing wide angle vignetting. Extra tough aviation aluminum frame ensuring durability and jamming prevention.
* 【NOTE】This Filter kit is compatible with all 37mm lenses. Please verify your camera's lens thread size(usually marked somewhere on the lens barrel or printed underneath the lens cap) before ordering. The number is always preceded by a "ø" (diameter) symbol.