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2. Orion Telescopes & Binoculars - Wikipedia

   en.wikipedia.org/wiki/Orion_Telescopes_&_Binoculars

   In late 2005 Celestron (which had recently been purchased by Synta Technology Corporation of Taiwan) announced an agreement that would allow Celestron 8, 9.25, and 11-inch (280 mm) Schmidt-Cassegrain optical tube assemblies (OTA), painted in metallic gray and using the "Orion" brand (Celestron OTAs are painted either gloss black or semi-gloss ...

3. Celestron - Wikipedia

   en.wikipedia.org/wiki/Celestron

   The predecessor of Celestron was Valor Electronics, an electronics and military components firm founded in 1955 by Tom Johnson. [1] [2] [3] Johnson became involved with telescopes when he built a 6" reflecting telescope for his two sons. [2] In 1960, Johnson established the "Astro-Optical" division of Valor, which would later become Celestron. [3]

4. Schmidt–Cassegrain telescope - Wikipedia

   en.wikipedia.org/wiki/Schmidt–Cassegrain_telescope

   People demonstrating a Schmidt–Cassegrain telescope at a sidewalk gathering. The Schmidt–Cassegrain design is very popular with consumer telescope manufacturers because it combines easy-to-manufacture spherical optical surfaces to create an instrument with the long focal length of a refracting telescope with the lower cost per aperture of a reflecting telescope.