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For 80mm Matte Box or 77mm filters etc., 48/49/52/55/58/60/62/67/72/77-77mm Step Up Ring filter Adapter Ring with 80mm O.D
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Amazon.com : 49 to 77mm Step Up Adapter Ring, 49mm Lens to 77mm Filter (49mm to 77mm) : Electronics
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NiSi Brass Pro 49-77mm Step Up Ring | NiSi Optics USA