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The design overcame the need for very long focal lengths in refracting telescopes by using an objective made of two pieces of glass with different dispersion, 'crown' and 'flint glass', to reduce chromatic and spherical aberration. Each side of each piece is ground and polished, and then the two pieces are assembled together.
This had an objective made by the makers Chance, with the overall telescope made by Thomas Cooke. [21] The telescope was made for Robert Stirling Newall, and when completed in 1869 was the largest refracting telescope in the world. [21] In the 1950s the University of Cambridge donated the Newall telescope to the National Observatory of Athens ...
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.
An Achromatic telescope uses an achromatic lens to correct for this. An achromatic lens is a compound lenses made with two types of glass with different dispersion. One element, a concave lens made out of Flint glass, has relatively high dispersion, while the other, a convex element made of Crown glass, has a lower dispersion. The crown lens is ...
A drawing of the telescope from an astronomy book. The fabrication of the two-element achromatic objective lens, the largest lens ever made at the time, caused years of delay. [2] The famous large telescope maker Alvan Clark, was in charge of the optical design. He gave the contract for casting the high quality optical glass blanks, of a size ...
Completed in 1899, it is a double telescope for astronomy; a great refractor with two objectives of different size on the same equatorial mount. [1] One lens in 80 cm in aperture and the other is 50 cm. [1] The 80 cm diameter lens was designed for astrophotography, and the 50 cm diameter lens for visual work. [2] The telescope was made by Repsold.
CEO of Adrian telescope maker PlaneWave explains James Webb Space Telescope's mission and why it is impressive as it starts second year in orbit.
The Newall Telescope is a 62.5 centimetres (24.6 in) refractor in the Penteli Observatory in Penteli, Greece.It was built in 1869 by Thomas Cooke for Robert Stirling Newall and when completed it was the largest telescope in the world.
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