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<blockquote data-quote="aroy" data-source="post: 296883" data-attributes="member: 16090">I always use UV filter. It protects the front element from the perennial dust that is Delhi. I have seen sand scratches on a lot of glass, and most of the lense front elements are not hard enough to prevent scratches from sand. If the front glass was not that vulnerable, could you not clean it with any fluid? But that will surely spoil the coating. That is why you are extra careful while cleaning the smudges of the front element.Modern filters are not only have much harder glass, but a variety of coatings both to maintain optical neutrality as well as to prevent scratches and any muck accumulating. In short I would rather wash the filter than my front element to clear it of the grime, dust and any other muck that accumulates during shoot in tropical out door environment. I have gone through technical literature and the transmission characteristics of many filter manufacturers. High end filters manufactured by Schneider and Hoya have excellent optical transmission characteristics and are much harder than the front element.</blockquote>

[QUOTE="aroy, post: 296883, member: 16090"] I always use UV filter. It protects the front element from the perennial dust that is Delhi. I have seen sand scratches on a lot of glass, and most of the lense front elements are not hard enough to prevent scratches from sand. If the front glass was not that vulnerable, could you not clean it with any fluid? But that will surely spoil the coating. That is why you are extra careful while cleaning the smudges of the front element. Modern filters are not only have much harder glass, but a variety of coatings both to maintain optical neutrality as well as to prevent scratches and any muck accumulating. In short I would rather wash the filter than my front element to clear it of the grime, dust and any other muck that accumulates during shoot in tropical out door environment. I have gone through technical literature and the transmission characteristics of many filter manufacturers. High end filters manufactured by Schneider and Hoya have excellent optical transmission characteristics and are much harder than the front element. [/QUOTE]

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