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Normalized Near Infrared NNIR = NIR / (NIR + Red + Green)
1550nm light is also generally considered to be “eye safe” (and safe for CMOS camera sensors)
The FK220 also includes a polarizer filter and film
The LP900 is a great option when viewing reflected 915nm laser diode light
Neutral Density (ND) Filter - Absorptive 50% Transmission, 425-675nm - MidOpt ND030 Size:27mm Normalized Near Infrared NNIR =The MidOpt ND030 Neutral Density (ND) Filter has an optical density of 0. 3, or average 50% transmission across the visible (VIS) spectrum. The ND030 has identical male and female threads on either end so it can be stacked with other ND filters to achieve various optical densities. For example, two ND030 filters stacked together would perform approximately the same as one ND060 Filter. MidOpt ND Filters are double side polished for exceptional
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