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Message: <blockquote data-quote="Upland" data-source="post: 3616372" data-attributes="member: 136306">Gentlemen this is getting silly. This is the precise reason I don't post on these sites much: internet experts who put words in your mouth. I'm simply sharing things that I've noticed. My understanding is that ED glass is a denser more mineral rich glass that has lower dispersion qualities that help to create sharper more CA free images. HD could mean the same thing or not depending on the manufacturer. You need to do your homework and find out what they mean by HD as I have found it to vary. Also I Never said the glass on a Terra was better than the Conquest  mearly that Zeiss told me the Terra's had ED glass and the Conquests did not. Anybody who's looked at both knows the Conquest has better glass. The Conquest is a fine binocular and I never said otherwise. They just didn't work for me. I'm done posting here. I'll let you experts carry on the conversation</blockquote>