Celestron 45-Degree Erect Image Diagonal (For 0.96" Focusers & 1.25" Eyepieces)

Celestron's Erect Image Diagonals are Amici prism designs, allowing you to look into the telescope at a 45° angle at images which are upright and laterally correct.  Eyepieces designed for 1.25" focuser barrel diameters typically have superior apparent fields of view and eye relief than the older designs of the 0.96" eyepieces, so using this diagonal with your telescope equipped with a 0.96" focuser significantly improves your viewing experience.