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B+W Filters > UV/IR 486 Filters

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B+W 39mm MRC 486 (UV/IR) Blocking Filter This B+W 486 UV/IR Cut filter has a completely colorless glass carrier which is coated with a number of extremely thin, partially reflecting layers. The B+W 486 does not block by means of absorption, but by interference of the unwanted UV and IR radiation that is repeatedly reflected between these layers, affecting the wavelengths on both sides of the visible spectrum with a steep cut-off. It is used mainly on digital and video cameras with CCD sensors without an integrated IR protection filter, because the IR sensitivity of the CCD sensor would otherwise cause color changes and unsharpness. That unsharpness results from the chromatic aberration of the lenses that are only corrected for visible light.