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The Dobsonian Mount was invented in the 1970s by John Dobsonian. It was designed to hold massive Newtonian Reflecting telescopes securely on the ground to provide a steady image. It is often used on Dobsonian telescopes that have very large apertures - anywhere between 6- and 20-+ inches! Many Dobsonian telescopes use the Dobsonian Mount, while others use the Equatorial Mount.