The Heliopan 77mm Gel Holder for 3 x 3" Filters is designed to hold 3 x 3" / 76.2 x 76.2mm gel filters in front of the lens. This ring also features 77mm female threads for attachment of additional circular filters or lens hoods in front of the gel. It is constructed from brass to help prevent jamming on the lens threads and to provide additional strength.
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Heliopan 77mm Gel Holder for 3 x 3" Filters Review