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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.
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 ...
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. [8] [9] The company manufactured a limited number of 30-inch and 36-inch telescopes. [10]
The Dobsonian seems to be a class of telescope that uses a combination of previously know innovations for a specific design purpose (a large, cheap, portable, deep sky instrument). It may be a misnomer to call any one of those design features "Dobsonian". i.e. The Dobsonians do not have "Dobsonian Mounts"; they have Altazimuth_mounts.
A dual speed focuser, replacing the original rack and pinion focuser of the Orion hit XT 10 dobsonian telescope.. The Dual speed focuser is a focusing mechanism used in precision optics such as advanced amateur astronomical telescopes and laboratory microscopes.
8 City sky 4.1–4.5 <18.00 the sky is light gray or orange – one can easily read; stars forming familiar constellation patterns may be weak or invisible; M31 and M44 are barely glimpsed by an experienced observer on good nights; even with a telescope, only bright Messier objects can be detected; limiting magnitude with 12.5" reflector is 13; 9
These heavy guns were intended to be mounted in seacoast fortifications. 8-inch, 10-inch, 13-inch, 15-inch, and 20-inch bore (20, 25, 33, 38, and 51 cm) Rodman guns were produced. Other than size, the guns were all nearly identical in design, with a curving bottle shape, a large flat cascabels , and ratchets or sockets for the elevating mechanism.
It has the combined magnitude of 8.1, with high surface brightness. Its small bright inner nebula subtends an average of 16.1 arcsec , with the outer prominent condensations about 25 arcsec. [ 4 ] Deep images reveal an extended halo about 300 arcsec or 5 arcminutes across, [ 5 ] that was once ejected by the central progenitor star during its ...
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