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Message: <blockquote data-quote="Steve C" data-source="post: 1280912" data-attributes="member: 56622">NWBirder,I try not to post things I'm not reasonably sure of, but I admit it took a bit of time to find this.  I'd seen this article in a couple of dealers who sell Vortex.  It is a sort of long infomercial, but the fact they do design their own and build the prototype is pretty well covered.  <a href="http://www.arrowtrademagazine.com/articles/sept_07/September2007-VortexOpticsProfile.pdf" target="_blank">http://www.arrowtrademagazine.com/articles/sept_07/September2007-VortexOpticsProfile.pdf</a>Now, I realize the term design does enter the picture.  I doubt seriously they have the capacity to grind lenses and prisms from blocks of raw glass, so their design is likely limited to a certain extent by what types of lenses and prisms they can obtain.  So they may well have some constraint based on the components they can obtain.  It does seem to be more of a design process than sending a spec sheet and a general idea to the orient.</blockquote>