Find the perfect balance of light and color with the 77mm X4 Nd Traction Filter from Breakthrough Photography. This 10-stop neutral density filter is designed for the discerning outdoor photographer, offering unparalleled color neutrality. It's the world's sharpest Nd filter, guaranteed, thanks to its Schott Superwhite B270 optical glass construction. This ultra-clear crown glass is made from high-purity raw materials using the continuous draw process, resulting in superior transmission across ultraviolet, visible, and infrared spectrums.The X4 Nd filter features a state-of-the-art multi-resistant coating (MRC16) applied to both surfaces of the glass disk. This coating reduces reflection, increases surface durability, and is structurally harder than the glass itself. The result is improved efficiency as less light is lost, and enhanced contrast and color due to the elimination of stray light.Designed as a workhorse for field work, the X4 Nd filter is built to withstand extreme conditions, from high winds to salt water, dust, and other abrasive elements. It's weather-sealed for your peace of mind and incorporates Breakthrough Photography's nanotec Nano Coatings Technology, which repels water and other elements rather than absorbing and smearing them.The X4 Nd filter is also the most color-neutral Nd filter on the market, thanks to Breakthrough Photography's alternative manufacturing methods. Traditional Nd filters often exhibit a strong blue or magenta cast, especially at higher Nd factors. However, the X4 Nd filter's manufacturing process ensures the most color-neutral performance, with a flat transmission curve that yields a perfectly color-neutral result.The filter frame has been redesigned from the ground up, constructed of high-quality brass and featuring Breakthrough Photography's signature traction frame. This makes the X4 Nd filter easy to attach and remove securely, even in cold conditions or when wearing gloves.Register your X4 Nd filter online to activate Breakthrough Photography's 25 Year Ironclad Guarantee. This filter is not just an investment in your photography equipment, but a commitment to quality and performance that will last for years to come..