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Old 21-08-2019, 09:22 AM
casstony
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Join Date: Feb 2006
Location: Warragul, Vic
Posts: 4,485
Even if the marks are only on the front surface (which appears to be the case) the lens should be cleaned whenever it accumulates significant deposits. Even it you don't get dust/pollen etc on the surface, dew contains substances that permanently mark the coatings over time.

You just need to avoid dragging particles across the surface or letting solvent wick around the edge of the lens.
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