Gosky 1.25 Inch 2x Achromatic Barlow Lens for Newtonian Telescopes (Black) Essentially double the power of any 1.25" telescope eyepiece with the Universal Barlow Lens Sophisticated fully multi-coated, eliminate unwanted reflections, increase contrast and correct colors Compatible with most 1.25-Inch diameter telescope eyepieces. Very compact size - just 3 inch long (half the length of a standard Barlow lens) - easy to stash in your accessory case Full black metal construction