B + W 46mm #499 Fluorescent Correcting Glass Filter - FL-D

Product DescriptionFlorescent lighting has characteristics that affect color rendition. This color shift is not usually visual to the human eye but will cause adverse effects on film. When shooting daylight film in florescent lighting your pictures will have a purplish or greenish tone. B&W's FL-D filter corrects and restores a normal color

Source: Digital Camera and Video Store...