K&F Concept 43mm Slim Fader Variable ND2-ND400 Neutral Density Adjustable ND ND2 ND4 ND8 ND16 to ND400 Lens Filter Kit + Microfiber Cleaning Cloth for DSLR Cameras Wider outer optic to help reduce vignetting at wide angles Made of high quality optical glass by K&F Concept technology Suitable for dynamic screen, waterfalls, streams, waves, etc. The filters are double-threaded, so you can stack your lens cap and other accessories as needed. Great for portraiture and outdoor scenes in strong sunlight. Brand of K&F Concept manufactured by a professional team,24 Month Manufacturer Warranty,100% Satisfaction Guaranteed.