55mm Pro series Multi-Coated High Resolution Digital Ultraviolet Filter For Pentax HD Pentax-DA 55-300mm f/4-5.8 ED WR Lens, Pentax HD Pentax DA 20-40mm f/2.8-4 ED Limited DC WR Lens (Black) 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 55mm HD Filter