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 This ultimate clear uv filter will not affect color balance. It protects lenses from expensive front element damage Reduces lens flare and ghosting Microfiber Cloth 52mm HD Filter