Infrared filter

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This is a B+W IR695 092 77mm filter; which, if you think about it, is a misnomer.  It doesn’t filter the near IR spectrum, it filters a goodly portion of the visible light spectrum.  IOW, it lets in IR light, keeps out most visible light. It appears black, but when you hold it up to the light it’s a deep deep red.  Pretty cool, huh?