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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 ...
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.
Meade ETX telescope; Meade LX90; Meade LX200; MySky This page was last edited on 24 December 2019, at 07:48 (UTC). Text is available under the Creative Commons ...
ETX may refer to: ETX (form factor), Embedded Technology eXtended computer-on-module specification; Meade ETX telescope, popular line of compact Maksutov-Cassegrain telescopes made by Meade Instruments Corporation; End-of-text character, character code within the C0 and C1 control codes range; Expected Transmission Count, network routing metric
Maksutov's 1944 design was the first-published meniscus telescope design, and was published in the widely-read Journal of the Optical Society of America. [11] [12] [7] This led to professional and amateur designers almost immediately experimenting with variations, including Newtonian, Cassegrain, and wide-field camera designs.
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.