More magnification for existing eyepieces to see the details of moon and bands of Jupiter clearly;the Barlow lens is a mustQuality and value 5x Barlow lens to give a big magnification boost to any 1.25 inch eyepieceIt will help double the capacity of an existing set eyepieces at the cost of a single eyepiece;It's super easy to use;you can simply insert eyepiece of choice into the Barlow lens;then insert it into the Barlow lens could also more magnification without reducing the exit hole on the eyepieceEven a made Barlow will little damage on the imaging qualitysize:31.7*65mmMaterial:Aluminum alloycolour:blackPackage Contents:1 * 5X Barlow LensOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.