Fotodiox Pro 77mm Slim Neutral Density 1000 (ND1000, 10-Stop) Filter - Full-Size - Black - FDXPro-ND1000-77mm Premium Grade optical glass filter; high quality, single threaded, ND1000 filter Premium Grade anodized aluminum ring; 77 mm standard filter threads; filter ring is 3mm thick Enables slow shutter speeds Decrease the effective Iso of high-speed film 24-Month Manufacturer Warranty