Necessary (or not?)

Hard to write a relevant product reviews. Like almost everyone, I bought this "UV filter" to ensure protection of the front lens of my Tamron 18-200, especially when pictures seafront where the spray of fine droplets settle whatever precaution taken. One can thus wiping the glass with a tissue or what is at hand, that no one would do on the lens itself. So obviously we always read purists controversy on the real utility of this accessory. As a filter, it is obviously irrelevant, objectives already being treated. The light absorbed? In a small percentage of difficult cases probably, in which case you can always remove it occasionally. Still, for a relatively small fee, there is unquestionably a useful safeguard. P'is that's it!