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
Baader's T-2, 90 degree prism gives extremely bright and very high contrast images to the viewer through very high transmission rates. With the release of this product Baader have maintained their exceptional standards of optical manufacturing.
The Takahashi muli-coated 90 degree diagonal is the perfrect complement to Takahashi eyepieces. This high quality diagonal features the Takahashi compression ring that firmly secures the eyepiece without marring the finish.