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This article is a list of notable unsolved problems in astronomy. Problems may be theoretical or experimental. Theoretical problems result from inability of current theories to explain observed phenomena or experimental results. Experimental problems result from inability to test or investigate a proposed theory.
Lens sag is a problem that sometimes afflicts very large refracting telescopes. It is the equivalent of mirror sag in reflecting telescopes. It occurs when the physical weight of the glass causes a distortion in the shape of the lens because the lens can only be supported by the edges. A mirror on the other hand can be effectively supported by ...
The Great Refractor was built in 1896 for the Great Industrial Exposition of Berlin. With an aperture of 68 cm (27 in), a focal length of 21 m (69 ft) and a movable mass of 130 metric tons, it is considered a masterpiece of technology. The lenses were made by C. A. Steinheil & Söhne. Since 1967, the telescope is a protected monument.
Capable of delivering good views of the moon, planets and deep-sky objects, this refractor telescope comes with a uniquely designed lens cap that doubles as a universal smartphone mount
This app-aligned telescope proves an affordable option for backyard moon and planet gazing. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ...
Celestron was the first large scale commercial manufacturer of the Schmidt-Cassegrain telescope, introducing its "C8" 8" diameter 2032 mm focal length, ƒ10 telescope in 1970. [7] The primary innovation Celestron/Tom Johnson devised was a method to produce Schmidt corrector plates using a vacuum to pull the glass blanks into a pre-shaped curve ...
Past product lines include refractors up to 206mm in aperture, a catadioptric design of 254mm, and an astrograph of 305mm. As of the end of 2021, the company's line of telescopes (optical tubes only, consisting of objective lens, tube, and focuser) included only a 92mm refractor and a 130mm refractor, priced in the $4000–$7000 range.
And of course they're sometimes used for entry-level star-gazing telescopes. Ycajal 18:45, 24 June 2018 (UTC) Refractors are used in much more than "entry-level telescopes." Astrophotography routinely uses refractors (and sometimes rather small 80-mm apochromatics) to create superb images.
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