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Tele Vue 3x Barlow Lens, 1.25".Tele Vue Barlows: "An Optically Perfect Window" Properly designed Barlows do wonderful things. First, they amplify power while retaining the eyepieces eye-relief. Second, they slow the telescopes f/#, which improves eyepiece sharpness. Third, the designer can introduce compensations for eyepiece aberrations. Tele Vue..