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List of largest optical refracting telescopes. The Grande Coupole for the double refractor of Meudon, with roughly 83 cm (33 in) and 62 cm (24 in) aperture lenses on the same mounting, and making its debut in 1891. Refracting telescopes use a lens to focus light. The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically ...
Refracting telescope. A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). The refracting telescope design was originally used in spyglasses and astronomical telescopes but is also used for long-focus camera lenses.
Great refractor refers to a large telescope with a lens, usually the largest refractor at an observatory with an equatorial mount. The preeminence and success of this style in observational astronomy defines an era in modern telescopy [ 1] in the 19th and early 20th century. [ 1] Great refractors were large refracting telescopes using ...
Apochromat. Chromatic aberration of a single lens causes different wavelengths of light to have differing focal lengths. An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses. The prefix apo- comes from the Greek ...
A 150mm aperture Maksutov–Cassegrain telescope. The Maksutov (also called a " Mak ") [1] is a catadioptric telescope design that combines a spherical mirror with a weakly negative meniscus lens in a design that takes advantage of all the surfaces being nearly "spherically symmetrical". [2] The negative lens is usually full diameter and placed ...
They house a Zeiss Cassegrain telescope (500 mm (20 in) aperture, 7,500 mm (300 in) focal length) and a refractor with coudé focus (150 mm (5.9 in) aperture, 2,250 mm (89 in) focal length). Two further domes on the roof of the main building house an astrograph (120 mm (4.7 in) aperture, 600 mm (24 in) focal length) and the historic Urania ...
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