| SCT - Schmidt-Cassegrain The Schmidt-Cassegrain is a catadioptric telescope. It combines a folded optical path with a corrector plate to make a compact astronomical instrument. |
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| Meade ACF Series Advanced Coma Free design by combining a hyperbolic secondary mirror with a corrector-lens-and-spherical-primary-mirror combination that performs as one hyperbolic element. This ACF design produces a coma-free, flat field of view that rivals traditional R |
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| Refractors The Refractor is a telescope. It an in-line optical path with a making a very strong astronomical instrument. |
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| Maksutov The Maksutov is a catadioptric telescope design that employs a full diameter meniscus lens (commonly called a "corrector plate") to correct the problems of off-axis aberrations such as coma found in reflecting telescopes while avoiding chromatic aberratio |
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| Dobsonian The Dobsonian telescope is a design that has become popular amongst amateur astronomers because it results in an extremely simple and rugged large-aperture instrument at low cost. The term "Dobsonian" or "Dob" refers to any telescope with an alt-azimuth m |
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| Newtonian The Newtonian Reflector, also known as catoptrics, is a telescope which uses a spherical or concave parabolic primary mirror to collect, reflect and focus the light onto a flat secondary mirror (diagonal). This secondary mirror in turn reflects the light |
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| X-Ray and Gamma-Ray X-ray and gamma-ray radiation go through most metals and glasses, but some X-ray telescopes use Wolter telescopes composed of ring-shaped 'glancing' mirrors made of heavy metals that are able to reflect the rays just a few degrees. The mirrors are usually |
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| Radio Telescopes Radio telescopes are directional radio antennas that often have a parabolic shape. The dishes are sometimes constructed of a conductive wire mesh whose openings are smaller than the wavelength being observed. Multi-element Radio telescopes are constructed |
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| Spotting Scopes A spotting scope is a portable telescope, optimized for the observation of terrestrial objects. The magnification of a spotting scope is typically on the order of 20X to 60X. |
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| Theodolite A theodolite is an instrument for measuring both horizontal and vertical angles, as used in triangulation networks. It is a key tool in surveying and engineering work, particularly on inaccessible ground, but theodolites have been adapted for other specia |
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| Binoculars and Monoculars Binocular telescopes, or binoculars (also known as field glasses), are two identical or mirror-symmetrical telescopes mounted side-by-side and aligned to point accurately in the same direction, allowing the viewer to use both eyes (binocular vision) when |
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| Ritchie Chretien Amateurs seeking the ultimate in large aperture telescopes should look no further. The super smooth polish and superb correction of an RCOS telescope delivers star images that have a sharp, almost "searing" quality. The optical tube assembly can be expen |
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