***** **********Best Quality Guranteed. ***** 12.5 mm Plossl eyepiece with red LED illuminated double line crosshair reticle; it's idea for measuring double star angular separations; position angles; planetary diameters and lunar crater diameters*****Steplessly adjust the brightness of dual crosshair reticle; rotate switch on the side to put it on; shut it off and adjust the brightness; a separate dioptre can also be adjusted to bring both the star and the crosshairs into focus simultaneously*****Multi-coated 4-elements Plossl design for excellent color correction and sharpness; it also offers excellent light transmission and sharp imaging on faint stars*****Wider view angle and bright high contrast views; 40 degree apparent field of view with 11 mm comfortable eye relief; It's a great Halloween birthday christmas gift*****Standard 1.25" eyepiece; suitable for any standard 1.25" telescope filters and other astronomical devices