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Message: <blockquote data-quote="mayoayo" data-source="post: 3459625" data-attributes="member: 16781">Joaquim..note that the term fluorite is often used to refer to any special,ED ,high density or low disperssion glass .With that in mind I think that the difference between regular glass and ED glass is definitively there ,even at low magnification..I see it in binoculars and also comparing 50mm scopes side by side..About the kowa 554... Not sure it does exist..me thinks not,thinks is typo..the new model mentioned in the kowa web site ,a 50mm indeed doesnt feature ED glass and is not very exciting..sad because kowa had a 50 mm ED model years ago,and they could have  introduced a similar scope and probably sell well</blockquote>