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Bk7 /K9/Jgs1/ Sapphire Porro Prism for Telescope Binoculars

Bk7 /K9/Jgs1/ Sapphire Porro Prism for Telescope Binoculars
BK7 /K9/JGS1/ sapphire Porro Prism for Telescope BinocularsPorro Prism is composed of one large face and two roof faces...

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