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The Meade "ETX" series Maksutov-Cassegrain telescope (105mm aperture). Meade produces a line of Maksutov telescopes under their ETX series (Everybody's Telescope). They were first produced in 90 mm (3-1/2") Maksutov Cassegrain telescope in 1996. They range in size from 90 mm to 125 mm.
The ETX started out as a 90 mm (3-1/2") Maksutov Cassegrain telescope (first produced in 1996) and took advantage of high volume mass production and simplified optical and parts construction to open a new market for a cheap alternative to the very expensive Questar 3-1/2 Maksutov Cassegrain [1] [2] The ETX "line" has been expanded to 105 mm, and 125 mm Maksutov Cassegrains and achromatic ...
This is a list of large optical telescopes. For telescopes larger than 3 meters in aperture see List of largest optical reflecting telescopes. This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time.
A. A. Common's 60-inch Ealing reflector [10] 1.524 m: 60" glass mirror reflector: World's largest glass mirror reflector 1889, sold to Harvard 1904, moved to South Africa 1920s (Boyden Observatory) where it was largest telescope in the southern hemisphere. Ealing, Harvard College Observatory, Cambridge, Massachusetts, USA;Boyden Observatory ...
Star Diagonal: Used to change the angle of the light coming out of a telescope, for easier viewing. Herschel Wedge: Similar to a star diagonal with a wedge-shaped unsilvered prism reflector that reduces incoming light by up to 95% for solar viewing. Coma corrector a correcting lens used to reduce coma distortion in fast reflecting telescopes.
Radio optical Telescope with 54 m Spherical Reflector Antenna and 2.6 m optical telescope on the same axis. One of the most sensitive and low noise antennas in the world. Operating during 1987-2010. Conserved from 2015. It is planned to revitalize it in 2020-2025 by the force of Armenian and International science-technical society.
A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century by Isaac Newton as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic ...
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 over a century.