This SV152 20mm premium 1.25" wide angle eyepiece includes an illuminated Single crosshair reticle that greatly simplifies centering celestial objects in the eyepiece for more accurate go-to alignment and tracking; An invaluable aid to centering guide stars and astrophotography target objects. It is the field of view that matter. Wide 70-degree apparent field of the sky allowing you to find objects and alignment stars more easily than shorter focal length eyepieces ;Comfortable 16mm eye relief; lets you easily find and locate target objects. There are also other uses for the SV152 crosshair eyepiece; The lighting part of the product is removable;with it you can use it as an illumination eyepiece.;remove it and you can use it as ordinary eyepiece. High magnification for eyepieces to see more details of the moon; bands of Jupiter clearly; SVBONY 2x barlow lens is a better choice. Completely multi-coated and pure optical glass lens for optimum image brightness high contrast.Clear and bright images can be obtained for moon, stargazing, etc.Cemented doublet optic structure reduce the chromatic aberration with the increase of magnification. 2x magnification with 1.25" interface. Doubles the magnification of any 1.25'' eyepiece. barlow lens is easy to use; simply insert the eyepiece into Barlow lens; then insert the Barlow lens into the scope.