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Celestron was the first large scale commercial manufacturer of the Schmidt-Cassegrain telescope, introducing its "C8" 8" diameter 2032 mm focal length, ƒ10 telescope in 1970. [7] The primary innovation Celestron/Tom Johnson devised was a method to produce Schmidt corrector plates using a vacuum to pull the glass blanks into a pre-shaped curve ...
Birdwatching is a very popular hobby among nature and animal lovers; a binocular is their most basic tool because most human eyes cannot resolve sufficient detail to fully appreciate and/or study small birds. [74] To be able to view birds in flight well rapid moving objects acquiring capability and depth of field are important.
The SkyScout was a handheld, battery powered device about 7.4" x 4.0" x 2.5", and weighing about 1 pound. It had a viewing port, a 3" x 1" LCD display on the side and several buttons for controlling and selecting device functions.
EBay’s stock price rose nearly 10% on Wednesday—one of its largest single-day increases in years—boosting the company’s market cap by about $3 billion to $33 billion.
A Dobsonian telescope on display at Stellafane in the early 1980s. A Dobsonian telescope is an altazimuth-mounted Newtonian telescope design popularized by John Dobson in 1965 and credited with vastly increasing the size of telescopes available to amateur astronomers.
Why Denny's stock crashed to within inches of its lowest price in over 10 years today. Food. Food. Eating Well. 22 winter dinners that would make grandma proud. Food. Country Living.
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