2x - 1.25" - X-Cel LX Barlow LensQuality X Cel LX 2x Barlow doubles the magnification of any 1. 25 eyepiece 3 element apochromatic, fully multi coated optics offer up bright, sharp images A rubber grip helps to avoid accidental drops Barrel is threaded to accept standard 1. 25 filters A brass compression ring holds the eyepiece firmly in place When inserted between the eyepiece and telescope, this X Cel 2X Barlow lens doubles the magnification of all your 1. 25 eyepieces. The premium