Neutral Density Filters   Neutral density filter sets make possible the attenuation, comparison, splitting or combining of beams in a wide range of irradiance ratios without significant change in chromaticity. These carefully prepared sets find wide applications. Different transmission ranges are 90%, 80%,....10%,.....0.1%,.....0.01%. Transmission range of any value can be obtained as per the requirement. Transmission and wave length tolerance is + 5%.