This high-quality 90-degree, multi-coated mirror diagonal allows you to take advantage of the wider field of view provided by two-inch eyepieces. Of much better quality than standard diagonals, it fits rear cells of all Schmidt-Cassegrain telescopes and comes standard with Celestron's CGE 1400 scope. Included is an adapter to accept 1.25-inch eyepieces and an adapter to use with refractor telescopes. As diagonals go, this one's a dandy!