Main Page | See live article | Alphabetical index There are three main types of astronomical telescopes - and these are divided into subgroups. They all have their different advantages and disadvantages and they are used in different areas of astronomy. Refractors (Dioptrics) Achromatic Non-achromatic Apochromatic Reflectors (Catoptrics) Newtonian Gregorian Classical Cassegrain Ritchey-Chrétien Schiefspiegler Combined Lens-Mirror Systems (Catadioptrics) Schmidt-Cassegrain Maksutov-Cassegrain These types can be mounted on different types of mounts. Altazimuth (ALT-AZ) Mounts Altazimuth mount Dobsonian mount Equatorial mounts Equatorial mount German equatorial mount Fork mount This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.