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Message: <blockquote data-quote="Dave_W" data-source="post: 116037" data-attributes="member: 9521">He on the right track, up to a point. He neglects to mention the dust/cleaning issue that a good filter provides as well as overstates the potential downside to having a filter for protection. These multicoated filters aren't going to shatter into small shards, rather they'll absorb the shock by breaking but still staying together. And perhaps a scratch on a mail element isn't going to strongly effect your image quality, but try convincing a potential buyer of your lens that...I dare you. Chances are you will have to deeply discount your lens in order to attract a buyer. So yes, I do agree with Tom to a point - if money is no object and you have no expectations of reselling your equipment, then sure, a filter is probably not for you. However, I "invested" in my lenses and I want to maximize my ROI when I go to upgrade my lenses.</blockquote>