Celestron 45 Degree Erect Image Diagonal 1.25
Celestron 45 Degree Erect Image Diagonal 1.25 is an erecting prism which is suitable for telescopes supporting eyepieces with a 1.25 inch diameter (31.8mm). Telescopes and eyepieces turn the image upside down. A reversing prism is used to erect the image. This way, terrestrial observations are possible as well!