Amazon.com : B + W 52mm UV Protection Filter (010) for Camera Lens - Xtra Slim Mount (XS-PRO), MRC Nano, 16 Layers Multi-Resistant and Nano Coating, Photography Filter, 52 mm, Clear Protector :
Walimex Slim CPL Filter 52 mm - walimex & walimex pro
Hoya YA3 Pro Orange Filter (52mm) A-52YA3 B&H Photo Video