A good filter does protect - one cannot deny this. I use the very best - SMC Pentax - bought by the dozen from a shop closing down in Dubai - various types - UV, Skylight, morning & evening, cloudy, close ups etc, some twenty years ago. Since I keep them in air tight British Munition boxes they are perfectly preserved. Here is how I use them:- a) I toss one out when I see scratches or swirl marks or coating deterioration b) I always ensure I have a collapsible rubber hood on my lenses. c) For that occasional $ 1000 shot I remove the filter d) For holiday photos I always use a skylight or UV filter One need s to use filters smartly guys!
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