I've used clear multi -coated protection filters on all my lenses since I've owned them even my Tamron SP 17mm f3.5 lens which uses a huge 82mm filters ( they actually don't screw into the lens, it has no thread, but into the lens hood that is threaded ) all the coatings on my lenses are perfect because I only clean the filters never the lenses, and if they get marked or scratched I throw them away and replace them