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 Dobsonian Telescope

Dobsonian telescopes were developed in the 1960's by John Dobson, an amateur astronomer. Having been fascinated by the Universe, John Dobson built his telescope, based on the Newtonian reflector telescope, out of every day common materials such as plywood and cardboard and is mostly, if not always alt-azimuth mounted. This simply meant that it had a simple two-axis mount for supporting and rotating the said telescope. This type of modified reflector telescope came to be known as the Dobsonian Telescope. Dobsonian Reflector telescopes are known for being great "deep sky" telescopes, mostly due to its' large aperture. Not only are they efficient for viewing the deep skies of the universe, they are also very light in terms of mass in proportion to the diameter of the objective, in other words, the viewer will have a very large image without an immovable giant telescope. In addition, Dobsonian telescopes are very simple to put together, with the altazimuth mounts typically compact, light-weight, and easy to point, making it a preferred choice for astronomers of all levels. However, for every positive there is a negative and the Dobsonian telescopes is no exception. Due to its large aperture and its design which was optimized for deep sky penetration, an equatorial mount was left out of the design equation, thus a user must move the telescope manually every few minutes or so in order to compensate for the rotation of the Earth. Additionally, it also suffers from balance issues, this is due to the fact that since the Dobsonian Telescope is usually in a fixed relationship to its altitude bearings, an addition or subtraction of equipment's such as finder scopes, and heavy eyepieces can render the unit useless until recalibrated. However, due to its' ability to penetrate the deep dark skies, The Dobsonian Telescope still remains a firm favourite in the Astronomy community for the amateur and professional astronomers alike.

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Read more: http://www.nbbinoculars.com/blog/

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