More About Telescope Diagonals
A telescope diagonal uses mirrors or prisms to redirect the beam of light upward — usually by 45 or 90 degrees — for more convenient viewing with refractor or Cassegrain telescopes. Orion Telescopes carries top-quality prism and mirror diagonals in both 1.25" and 2" sizes, including some with enhanced, ultra-high reflectivity optical coatings. While many diagonals produce a backwards view, our correct-image diagonals provide a correctly oriented image, which is practical for terrestrial viewing.
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