Use the iOptron 90° Dielectric Star Diagonal to place your head in a comfortable viewing position when your refractor or catadioptric optical tube assembly (OTA) is aimed at or near the zenith. Built with a dielectric hard-coated BK-7 glass mirror, the diagonal transmits more than 99% of the incoming light to ensure clear and bright high-contrast images while maintaining maximum resolution.
 Designed to be lightweight and durable, the diagonal features an aluminum housing with a black anodized finish. The 1.25 barrel and eyepiece holder makes it compatible with the most popular size focusers, drawtubes, and accessories; and the brass compression ring in the eyepiece holder ensures your eyepieces won t get marked or marred when locked into place. An internal integrated safety stop in the eyepiece holder protects the mirror and ensures a long life.
