Zoom from low to high power in an instant with this versatile eyepiece! Simply grip the rubberized barrel and turn it slowly while looking through the eyepiece. Compatible with any telescope that accepts 1.25" eyepieces the Celestron 8-24mm Zoom Eyepiece - 1.25in is a fully multi-coated premium eyepiece for crisp, clear images that zooms to any focal length between 8mm and 24mm - you pick the best magnification for your subject. The folding eyecup lets you view with or without glasses, and the field of view (40 - 60°) works well for terrestrial observations as well as for views of the Moon, planets, and deep-sky objects. Zoom from low to high power in an instant with the Celestron 8-24mm Zoom Eyepiece - 1.25in!