Amazon.com : (2 Pcs) 52-72MM Step-Up Ring Adapter, 52mm to 72mm Step Up Filter Ring, 52 mm Male 72 mm Female Stepping Up Ring for DSLR Camera Lens and ND UV CPL
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Amazon.com : (2-Pcs) 52-67MM Step-Up Ring Adapter, 52mm to 67mm Step Up Filter Ring, 52 mm Male 67 mm Female Stepping Up Ring for DSLR Camera Lens and ND UV CPL Infrared