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In 1970 Celestron introduced its "C8" 8" diameter 2032 mm focal length, ƒ10 telescope, the first of a new line of telescopes built using methods developed by Celestron to produce Schmidt-Cassegrains at a high volume and low cost. [1] These models made significant inroads into the amateur astronomical and educational communities.
A prism diagonal uses a simple 90°-angle prism, pentaprism, or an Amici roof prism rather than a mirror to bend the optical path. On telescopes with a longer focal ratios, a well-made 90° prism diagonal is the optimum choice to deliver the highest image contrast short of using the telescope without a diagonal entirely.
Nexstar Media Group, Inc. is an American publicly traded media company with headquarters in Irving, Texas, Midtown Manhattan, and Chicago.The company is the largest television station owner in the United States, owning 197 television stations across the U.S., most of which are affiliated with the four "major" U.S. television networks and MyNetworkTV in markets as large as New York City and as ...
Mission Broadcasting, Inc. is a television station group that owns 29 full-power television stations in 26 markets in the United States. The group's chair is Nancie Smith, the widow of David S. Smith, who founded the company in 1996 [3] and died in 2011.