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Edmund Optics announces TECH SPEC NIR Neutral Density Filters Edmund Optics announces TECH SPECâ„¢ NIR Neutral Density Filters. NIR ND filters feature a spectrally flat region between 700 and 1100nm, outstanding parallelism, and exceptional surface characteristics. The combination of high tolerance and broadband performance makes our filters ideal for attenuating a wide range of IR sources.
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