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Message: <blockquote data-quote="BruceH" data-source="post: 3616378" data-attributes="member: 106398">"HD" is not a type of glass, it is a marketing term.  It seems to have caught on during the HD TV transition where the optics sellers were wanting to get some benefits from all of the HD hype at the time.  Here is what Zeiss has to say about ED and HD (Underlines are mine):--------------------What is the difference between FL, HD, HT and ED?ED = Extra low Dispersion = low chromatic aberrationsHD = High Definition. HD is not a type of lens. Instead it describes the result of the ED lenses: very good resolution FL = Fluoride Lenses; a special, high-quality sub-category of the ED lenses HT = High Transmission = lenses by Schott with very good transmission properties.We use HT in the sense of a complete HT concept: binoculars that are based on the FL binoculars but which have extremely high levels of light transmission. VICTORY HT binoculars also have FL and HT lenses.________________Extra low dispersion glass is higher quality so someone with a good eye should notice a difference between a binocular with ED glass vs. one without for the reasons given by Upland, all other things about the binocular being equal.  Upland ...... That is confusing when we each get a different answer to the same question.  My bet would go on ED glass for the Conquest.  One reason is that the Conquest is a higher tier than the Terra and the Terra has ED glass.  There are different quality levels of ED glass and I would think the Conquest glass is up in quality compared to the less expensive Terra.  Second, Ziess says in the above quote that "HD" describes the result of the ED lenses.  That implies to me that the HD Lens System uses ED glass.  If I find out more, I will post it.  Please do not let a couple of persnickety comments discourage you from posting.  I for one appreciate your contributions.  Thanks for the info on the Luepold.  If you liked it other than the CA, then you may have success with the new Traveller.  Sightron is a Kenko company and Sightron's mission is to sell to the hunting market here in the U.S.  I believe at least some of the Sightron products are made in the Philippines.  I might be wrong on that, but I recall that it is somewhere other than China or Japan.  Some of the older Sightron products were lacking on specs and much appeared to be going after the value market.  I have not looked at them lately.<a href="http://www.kenkoglobal.com/about-us/group-company-chart.html" target="_blank">http://www.kenkoglobal.com/about-us/group-company-chart.html</a>On Edit:Here is the post from Gary, who was with Zeiss at the time, stating ED glass for the Conquest HD.  <a href="http://www.birdforum.net/showpost.php?p=2362015&postcount=43" target="_blank">http://www.birdforum.net/showpost.php?p=2362015&postcount=43</a></blockquote>

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