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The mount resembles an Altazimuth mount, but with the azimuth axis tilted and lined up to match earth rotation axis with a piece of hardware usually called a "wedge". [6] Many mid-size professional telescopes also have equatorial forks, these are usually in range of 0.5-2.0 meter diameter.
Alt-alt mounts, or altitude-altitude mounts, are designs similar to horizontal equatorial yoke mounts or Cardan suspension gimbals. This mount is an alternative to the altazimuth mount that has the advantage of not having a blind spot near the zenith, and for objects near the celestial equator the field rotation is minimized. [7]
In the largest telescopes, the mass and cost of an equatorial mount is prohibitive and they have been superseded by computer-controlled altazimuth mounts. [5] The simple structure of an altazimuth mount allows significant cost reductions, in spite of the additional cost associated with the more complex tracking and image-orienting mechanisms. [6]
Telescope mount - Types include: Altazimuth mount; Equatorial mount. Equatorial platform. Poncet Platform; Fork mount; German equatorial mount; Springfield mount; Optics
Fixed mount; Transit mount; Zenith mount; Altazimuth mount; Alt-alt (altitude-altitude) mount; Equatorial mount. Equatorial platform. Poncet Platform; Open fork mount; German equatorial mount; English mount (Polar frame mount) Modified English mount; Barn door tracker (Scotch mount) Springfield mount; Hexapod mount; Infinite-axis telescope ...
The altazimuth mount does have its own limitations. Un-driven altazimuth mounted telescopes need to be "nudged" every few minutes along both axes to compensate for the rotation of the Earth to keep an object in view (as opposed to one axis for un-driven equatorial mounts), an exercise that becomes more difficult with higher magnifications. [11]
Like a standard equatorial mount, equatorial GoTo mounts can track the night sky by driving the right ascension axis. Since both axes are computer controlled, GoTo technology also allows telescope manufacturers to add equatorial tracking to mechanically simpler altazimuth mounts.
The telescope is a 10-meter (394 in) diameter off-axis Gregorian telescope in an altazimuth mount (at the poles, an altazimuth mount is effectively identical to an equatorial mount). It was designed to allow a large field of view (over 1 square degree) while minimizing systematic uncertainties from ground spill-over and scattering off the ...
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