Seamless Magnification Control: A simple twist of the zoom housing adjusts focal length from 7mm to 21mm; Ideal for planetary clusters, lunar details, and deep-sky nebulae observation
Extended Eye Relief for Eyeglass Users: 16 to 33 mm adjustable eye relief accommodates eyeglass wearers with zero vignetting; Foldable soft-rubber eyecup ensures comfortable viewing at all focal lengths
Versatile for All Observers: Wide 30 degree to 47 degree apparent field of view adapts to planetary and deep-sky targets. Precision stepless zoom mechanism outperforms fixed focal length eyepieces
Precision Tool: Illuminated Reticle Eyepiece with red LED illuminated dual-line crosshair reticle precision tool for measuring double star separations planetary lunar dimensions and celestial position angles
Comfortable Eye Relief: This Illuminated Crosshair Eyepiece offers a wider field of view with bright high-contrast images featuring a 40 degree apparent field of view and 11 mm of comfortable eye relief