Dobsonian telescope
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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
A Dobsonian telescope on display at Stellafane in the early 1980s
Two amateur built Dobsonians at Stellafane in the early 1980s
A modified Dobsonian from 1983 that features a collapsible open tube assembly with integrated bearing surface and a very compact "rocker box" mount.
Two Dobsonians that combine a truss tube, compact "rocker box", large radius altitude bearings, and a collapsible design.
Altazimuth mount
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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 v
Dobsonian telescope
…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…
A Newtonian telescope on a simple Dobsonian mount
A heliostat at the THÉMIS experimental station in France. The mirror rotates on an alt-azimuth mount. The pointing direction of the mirror is perpendicular to its surface.
One of the 8.2 m (320 in) telescopes at Paranal Observatory. The entire building constitutes the altazimuth mount, saving on mass and cost.
A refracting telescope (with finderscope and accessories) on a small alt-azimuth mount.