Even a well made Barlow will little damage on the imaging qualityMore magnification for existing eyepieces to see the details of moon and bands of Jupiter clearly;the Barlow lens is a mustQuality and value high power 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 scopeBarlow lens could also provide more magnification without reducing the exit hole on the eyepieceMagnification: 5XLens material: optical glass lensLens coating: Broadband coatingThread specification: M28.5x0.6 pitchAppearance color: blackNet weight: 12g/pcsGross weight: 16gInterface size: 1.25 inches (about 31.7mm)Material:Aluminum alloycolour:blackPackage Contents:2 x 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.