SUPERIOR IMAGE QUALITY - Crafted from Water White Glass, this filter ensures exceptional clarity and prevents color shifts, maintaining true-to-life colors in your photographs. EXCEPTIONAL LIGHT REDUCTION - Achieve creative control with a 7-stop (ND2.1) neutral density, allowing wider apertures in bright light for shallow depth of field effects. INCREASED DURABILITY - The robust glass construction offers enhanced resistance to scratches and impacts, ensuring long-lasting performance even in demanding shooting conditions. BROAD COMPATIBILITY - Designed with 6.6x6.6' dimensions (167.6 x 167.6mm), this filter is compatible with professional matte boxes and filter holders for versatile use.