Professional Digital HD Multi-Coated Ultraviolet UV Filter All Sizes for Lenses | eBay
Amazon.com : 52mm Pro Series Multi-Coated High Resolution Digital Ultraviolet Filter for Pentax smc DA 50mm f/1.8 Lens, Pentax DA 18-55mm f/3.5-5.6 AL WR Zoom Lens : Electronics
Photographic filter - Wikipedia
Professional Digital HD Multi-Coated Ultraviolet UV Filter All Sizes for Lenses | eBay
Amazon.com : waka 52mm MC UV Filter - Ultra Slim 16 Layers Multi Coated Ultraviolet Protection Lens Filter for Canon Nikon Sony DSLR Camera Lens : Electronics
Amazon.com : Hoya 52mm Pro-1 Digital UV Screw-in Filter : Camera Lens Sky And Uv Filters : Electronics