Televue Tele Vue Barlow Lens 2X 2 (Big Barlow) with Brass Clamp Rings (bwc2200)

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 Vues 2" 2x BIG Barlow, 1 1/4" 2x and 3x Barlows were envisioned as magnification windows. Multi-coated high index glasses assure optimum aberration correction, exceptional contrast and virtually no light loss. Tele Vue Barlows achieve their design goals even when tested by the fastest scopes. They even improve our competitors eyepieces and telescopes!