The Century Optics 82 MM 100U Intermediate Ring is used as a lens adapter ring for 82mm TH16x5.5 lens that comes with the JVC GY-HD Series HDV camcorders.Using this ring, the TH16x5.5 lens is made adaptable with the WA-7X93-00, WA-7X5X-00, and WA-FESU-RD adapter sets