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As long as the weather permits, the Observatory offers free public telescope viewing every night the observatory is open - usually beginning at 7:00 p.m. This includes the historic 12" Zeiss Refracting Telescope on the roof, and up to four portable telescopes placed outside offering views of visible celestial objects for the night.
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 .
Refracting telescopes use a lens to focus light. The Swedish 1-m Solar Telescope , with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for ...
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 ...
Its optical telescope measures twelve tons and was designed by Carl Zeiss AG in Jena, Germany, considered as a technical masterpiece. Urania's refractor topped technological history as "Urania type". [2] On its centenary anniversary, telescope and dome were fully renewed.
Since opening in 1935, more than seven million people have put an eye to Griffith Observatory's original 12-inch Zeiss refracting telescope. More people have looked though it than any other telescope in the world. — Preceding unsigned comment added by 198.180.167.11 15:08, 3 January 2014 (UTC)