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Message: <blockquote data-quote="Eye-level" data-source="post: 76501" data-attributes="member: 6548">Lens glass changes with age.  It aquires a patina if you will.  This is how they discovered lens coatings.  In the old days when a lens "varnished" over people threw them away and got a new lens.  At some point someone discovered "varnished" over lenses were actually sharper than plain brand new ones and they helped with all sorts of other optical problems and thus was born the idea of lens coatings.  That 50 year old lens you have likely performs better now then when it was new!</blockquote>