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ED vs SD
Hi Andrew, Many thanks for that information, ive followed it up and there is a wealth of information there on these scopes and types of glass used in scopes, followed up on Fluorite glass also, seems its a bit fragile in some ways, exposure to the wrong climatic conditions Etc. can damage them, ms thats why Canon and otheres went for ED glass for their Camera Lenses generally, quite a bit on Triplets vs. Doublets also, as you say " the proof of the pudding is in the eating", thanks again.cheers....Jim
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