The HB-111 is a bayonet lens hood that protects the NIKKOR Z 26mm f/2.8 lens from lens flare while shooting. It also allows for the attachment of 52mm filters. When using a Circular Polarizing filter or NC filter, you must attach the filter to the HB-111 lens hood and not the lens itself. Only use one filter at a time. You can attach the LC-K108 lens cap to the lens hood to further protect the lens when not shooting. The HB-111 is supplied with the lens.