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Message: <blockquote data-quote="Robert Ellis" data-source="post: 294205" data-attributes="member: 19807">Bingo, that is why most specs, including IPD, are roughly the same.  There are actually two popular designs out there.  I wont say exactly a total list of which are related to which for fear of upsetting those here who represent the companies, but all the consumer needs to do is look at the diopeter ring, the end of the central hinge, and the eyecups to see which are related.  By the by, alike  housings are assembled in both Chinese and Japanese factories, so the same design could originate from either depending on price point.I spoke to Vortex the other day and they report strong sales and demand through their affiliated retailers for the DLS.</blockquote>