K&F Concept 49mm Slim HD Multi-Coated Variable Polarizing ND Neutral Density Adjustable ND2 ND4 ND8 to ND400 Lens Filter + Lens 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 ND Filter 49mm,Neutral density can be adjusted from ND2 to ND400.Reduces the amount of light reaching the film without affecting the color. Suitable for dynamic screen, waterfalls, streams, waves, etc. Brand of K&F Concept manufactured by a professional team,24 Month Manufacturer Warranty,100% Satisfaction Guaranteed.