Product picture - Celestron Visual Back - Screws Onto the Rear of Most Schmidt-Cassegrain Telescopes and Allows Use of 1.25" Diagonals, Tele-Extenders & Other Accessories Celestron, Visual, Back, Screws, Onto, Rear, of, Most, Schmidt-Cassegrain, Telescopes, Allows, Use, of, 1.25, Diagonals, Tele-Extenders, &, Other, Accessories Click the image to close this page