Agena 1.25" Wireless Illuminated Reticle Eyepiece with Focusable Dual Crosshair - 20mm Premium quality 1.25" 20mm focal length wide angle eyepiece with illuminated double-line crosshair reticle Excellent for accurate polar and go-to alignment, and for centering guide stars for astrophotography Adjustable image and reticle focus and adjustable reticle brightness Bright high-contrast views with a 70 apparent field of view and 16mm eye relief Large center box between crosshairs for easier use and alignment