Breakthrough Photography 49mm X4 Solid Neutral Density 0.9 Filter - 3 Stop

X4 Solid Neutral Density 3-Stop Filter The X4 ND delivers the most color neutral performance and precise optical density thanks to years of research and advanced manufacturing methods. Featuring our spectrally flat coatings and a precision machined brass traction frame, the X4 ND is designed to be incredibly sharp and built to last a lifetime. Full Spectrum Performance The color cast seen in most neutral density filters on the market can be seen on a spectral graph as deviations from a flat curve - usually a color cast that results in an increase in transmission throughout the visible spectrum. The X4 ND has the flattest transmission curve throughout the visible range and well into infrared, leading to a more color neutral performance. And thanks to years of research and development, the X4 ND is incredibly precise to the ideal optical densities. An optimal 10-Stop (3.0) ND filter has a light transmission of 0.1%. With an average light transmission of 0.108% across the both visible and