Agena 1.25" Wireless Illuminated Reticle Eyepiece with Focusable Single Crosshair - 24mm Cordless 1.25" 24mm focal length eyepiece with red LED-illuminated 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 and high-contrast views with a 50 apparent field of view and long 20 mm eye relief Illuminator requires two SR-54 / LR-44 batteries (included)