NEW!! Olivon 2″ 90° Erecting Image Roof Prism Diagonal with 1.25″ adapter included. Fully Multi-Coated BK7 prism. An excellent diagonal for looking at the moon and the stars. Even better for land viewing. The 90º Erecting Image Diagonal will display a correctly oriented scene in all directions (right side up, and left-to-right correct). Premium grade, thick, precision, optical flat mirror-based diagonal for all 2″ and 1.25″ focusers and eyepieces. The Olivon 2″ 90° Erecting Image Roof Prism Diagonal utilizes a non-marring compression ring fitting to protect your eyepieces from scratching.