1.25 Inch 90 Degree Astronomical Diagonal Mirror/Erecting Prism
Simply insert the erecting prism into the 1.25 "focuser and enjoy upright and right-angled images with your eyepieces. A more comfortable viewing position and clear images. Reflectivity: 90%. Size:Approx.14x9x5cm/5.51"x 3.54"x1.97".