The Danubia 2x Achromatic Barlow Lens For 1.25" Eyepiece will increase the magnification of the eyepiece by 2 times, thereby making it easier to spot details of the nearest planets. It has also been manufactured to eliminate. Colour fringing within the lens, thereby giving a purer image. This barlow lens can also be used as a T2 mount photo adapter, allow you to connnect your D-SLR camera to your telescope.