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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 ...
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.
Oblique view from Apollo 15 Oblique view from LRO Gruithuisen Gamma, Delta and North-West domes as viewed from Earth (8" Dobsonian telescope, untracked). Due to severe foreshortening, Gamma look like an upturned bathtub or loaf of bread.
Some telescopes are classified by the task they perform; for example Solar telescopes are all designs that look at the Sun, Dobsonian telescopes are designed to be low cost and portable, Aerial telescopes overcame the optical shortcomings of 17th-century objective lenses, [1] etc.
A Newtonian telescope on a simple Dobsonian mount. An altazimuth mount or alt-azimuth mount is a simple two-axis mount for supporting and rotating an instrument about two perpendicular axes – one vertical and the other horizontal. Rotation about the vertical axis varies the azimuth (compass bearing) of the pointing direction of the instrument.
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