PolarPro QuartzLine Filter 77 mm ND64

6-Stop Neutral Density Filter for photographers and cinematographers looking for full shutter control and zero image degradation 99.9% Pure Fused Quartz glass element with a base refractive Index of only 1.46 for razor sharp images 6-Stop Neutral Density Filter for photographers and cinematographers looking for full shutter control and zero image degradation 77mm Rugged Brass Frame New optical coating technologies achieve near perfect target transmission while maintaining a Hyper Neutral Color profile Abrasion Resistant and Hydrophobic coatings increase surface hardness and make cleaning easy Includes QuartzLine Filter, Soft Filter Case, Hard Filter Case, Microfiber Cloth, and a Lifetime Warranty