Amazon.com : Tiffen 58CP 58MM Circular Polarizer Glass Filter Black : Camera Lens Polarizing Filters : Electronics
New Tiffen 58mm UV Protection & Circular Polarizing Filter Photo Twin Pack | eBay
Amazon.com : High Definition 58mm CPL Circular Polarizing Filter with Multi-Coating for Canon EF 24mm f/2.8 is USM Lens, Canon EF 28mm f/1.8 USM Lens, Canon EF 50mm f/1.4 USM & Canon