Opteka 82mm Circular Polarizing Filter for Canon EF 24-70mm f/2.8L II USM Lens | eBay
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Amazon.com : High Definition 67mm CPL Circular Polarizing Filter for Canon EF 70–200mm USM Lens, Canon EF 70−300mm USM Lens, Canon EF 35mm f/2 is USM Lens & Canon EF 100mm f/2.8L
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