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The 24-inch (610 mm) Dobsonian telescope brought by the Sidewalk Astronomers was unconventional, because most telescopes at such meetings tended to be smaller, on equatorial mounts, and designed for astrophotography rather than optical viewing. Surprisingly (and controversially at the time) Dobson's telescope tied in first prize for best optics.
GoTo mounts are pre-aligned before use. When it is powered on, it may ask for the user's latitude, longitude, time, and date. It can also get this data from a GPS receiver connected to the telescope or built into the telescope mount itself, and the mount controller can have its own real time clock.
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. Dobson's telescopes featured a simplified mechanical design that was easy to ...
In 2007, Obsession Telescopes released a second series of telescopes more portable than their original design. They designated this series as Ultra Compact (UC), referring to their former one as 'Classic.' From 2009-2012 their telescopes ranged from USD 3000 for a 12.5 inch telescope, up to USD 12–15,000 for a 25-inch telescope.
4.5-inch (110 mm) LightBridge Mini 114 Dobsonian. Schmidt-Newtonian telescopes (6 to 10 inches). LightBridge Dobsonian telescopes (currently 8, 10, 12 and a 16-inch model) Meade Model 4504: 4.5-inch (110 mm) equatorial reflecting telescope
There is a 16-inch Meade LX200 Schmidt-Cassegrain telescope (SCT) and a 14-inch Celestron CGE1400 Schmidt-Cassegrain telescope, each housed under separate domes and permanently mounted. Also available for observing are two 8-inch Celestron NexStar SCTs, a 10-inch Orion XT10 Dobsonian , an 11-inch Celestron CGE1100, and JMI RB-66 reverse binoculars.
Some sidewalk "pitch men" charged the public to view astronomical objects through their telescope but other astronomers allow people to view for free. [6] [10] In more recent years sidewalk astronomy has come to be more associated with altruistic individuals or groups offering views of the nighttime sky as a free public educational service. [11]
Primary lens: The objective of a refracting telescope. Primary mirror: The objective of a reflecting telescope. Corrector plate: A full aperture negative lens placed before a primary mirror designed to correct the optical aberrations of the mirror. Schmidt corrector plate: An aspheric-shaped corrector plate used in the Schmidt telescope.
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