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<p>[QUOTE=&quot;desertgem, post: 424022, member: 15199&quot;]Glass is usually not the outermost surface of a lens. The outer surface of most, and especially very prestigious and expensive lens is a thin film rare earth mixture which is much softer than glass. These layers are usually 2-5 millionth of an inch thick and if a gold coin was rubbed against the lens surface, I am sure the lens surface would lose. </p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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