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Message: <blockquote data-quote="Binastro" data-source="post: 3423935" data-attributes="member: 111403">There were plenty of problems before lens coatings.Certain lens types were easily scratched. Some old Leica lenses are notorious with the outer surfaces very bad.That is how we came to todays lens types. Trial and error.Some of the modern exotic lens types must be coated immediately they are made as they deteriorate straight away.There is a lot going on that the end user just doesn't realise.Modern lens coatings on outer surfaces are often harder than the glass underneath.</blockquote>