Optics Nc ND8 (Neutral Density) Multicoated Glass Filter (55mm) For SAL-75300 AF D 75-300mm f/4.5-5.6 TYPE: Solid ND | RESISTANCE: Scratch, Water, Oil | DENSITY: 0.9 (3 Stops) | CONSTRUCTION: Schott Glass | THICKNESS: 0.25" (~ 6mm) | FOILS: Steinmetz High Efficiency | COATING: X Optical Nano (2 Layer) | TRANSMISSION (LIGHT): 99.2% HIGH QUALITY GLASS: Multi Green Coated - Double Layer Polish Slim Design Minimizes Vignetting Water Repelling, Oil Repelling, Scratch Resistant 10 Year Warranty