72mm Pro series Multi-Coated High Resolution Digital Ultraviolet Filter For Sigma 18-35mm f/1.8 DC HSM Lens, Sigma 18-35mm f/1.8 DC HSM Lens, Sigma 17-70mm f/2.8-4 DC Macro OS HSM 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 72mm HD Filter