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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 ...
BEST TELESCOPE DEAL FOR BEGINNERS: Those who are taking baby steps in the astronomy world will benefit from the Celestron AstroMaster 70AZ Telescope — $125.99 $185.95 (Save $59.96)BEST COMPACT ...
Telescopes can be classified by optical design or mechanical design/construction. Telescopes can also be classified by where they are placed, such as space telescopes. One major determining factor is type of light, or particle being observed including devices referred to as "telescopes" that do not form an image or use optics.
The Extremely Large Telescope under construction in June 2024. These telescopes are under construction and will meet the list inclusion criteria once completed: Extremely Large Telescope, Chile – 39.3 m (1,550 in). Construction began in 2018, first light planned in 2028. [23] Thirty Meter Telescope, Hawaii, USA – 30 m (1,200 in).
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CSRH is an interferometer under construction in China. The CSRH will consist of 100 telescopes covering 0.4–15 GHz. 40 telescopes of 4.5 m cover 400 MHz – 2 GHz and 60 telescopes of 2 m cover 2–15 GHz. CSRH will be one of the world's largest and most advanced imaging spectroscopy instruments.
Background: The focus tube and main telescope tube containing the achromatic doublet objective lens. The Galileoscope uses a 32 mm ( 1 + 1 ⁄ 4 in) focuser, giving the telescope a great deal of versatility, since this is the standard size for eyepieces used in most amateur and some professional telescopes.
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