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Televue 2x Barlow 1.25 inch (1-1/4 in.)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. ..