I am sure that everyone here is aware of the "filter vs no filter" debate. I have used filters on my glass for a while, then decided that it's not doing me any favors IQ wise, at best, and at worst, it degrades the image quality; in 6 years and going through perhaps a dozen lenses, I had exactly 1 scratch on front element, and I am not sure filter would've helped there. However, somebody somewhere said that the coating quality on older lenses wasn't that good, and that the repeat cleaning would wear it off, which is why you must put filters on them. Is there any truth in it ? Or is it mere BS ? I am using blower / lenspen method, btw, and only clean lenses when they look really smudged with dust and fingerprints - I rarely shoot above f8 anyway. Opinions ?