Nikon BF-3B Front Lens Cap for Nikon TeleConverters

TheNikon BF-3BReplacementFrontMountCap for NikkorAF-STeleconvertersreplaces theBF-3A. It is a protectivecapthat goes on thefrontof yourteleconverter. A tight seal, thanks to the bayonet lock, prevents liquids, dust and dirt from ruining yourteleconverter.