ND400-39 | ND400 Neutral Density Filter - Absorptive 0.01% Transmission

The MidOpt ND400-39 ND400 absorptive neutral density filters have an optical density of 4.0, meaning that they transmit an average of 0.01% of visible light. Surprisingly, this amount of light passing through the filter is easily detectable by the human eye. Because the glass substrate is absorbing 99.99% of the light that passes into the filter, it is not recommended that these filters be used in laser applications or immediately in front of high wattage lamps. All MidOpt filters can also be purchased unmounted and in custom dimensions upon request from Machine Vision Direct.