First of all, for ALL Leupold glass... Like most manufacturers in the consumer optical business (Photography, Astonomical, Sporting, etc.), Leupold outsources its optical glass. They are made to their exacting specifications and are tested in their Portland, Oregon facility for metting their exacting requirements and high standards. There are actually only a few optical glass suppliers in the world. Leupol purchases from companies in Europe, Japan, and the U.S. - none are purchased from any Asian company outside of Japan (particularly China). Leupold uses the same suppliers as many of the best Europen scope makers.
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