I used (use) Hoya and Vivitar clear filters on my film camera lenses as well as lens hoods. I've been doing that since the 70's. I use B+H clear filters on my digital camera lenses as well as lens hoods. I don't care if it helps or hurts as my images are pleasing to me and I'd rather clean a filter than the lens. I've never broken a filter but I've cleaned a few.