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Olivon's 90° Dielectric Star Diagonal features a dielectric multicoated optically flat mirror that virtually eliminates light loss to preserve image brightness and contrast. This star diagonal provides a more comfortable viewing position for when a refractor or Cassegrain OTA is pointed at or near the zenith, and only corrects the image horizontally. The male end fits into 2" focusers, and the prism accepts 2" eyepieces, or 1.25" eyepieces using the included adapter. A compression-ring fitting in the eyepiece holder won't mar the barrel, and a thumb screw secures it in place.