Apochromatic & multi-coated, the Celestron X-Cel LX 3x Barlow Lens is a great choice to increase the magnification of an eyepiece by 3x. When placed between the telescope & eyepiece, it provides a clear & sharp sky view, especially during planetary & lunar observations. The Celestron Barlow Lens has a durable anodised housing & a strong rubber grip to prevent slips & drops.