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Primary lens: The objective of a refracting telescope. Primary mirror: The objective of a reflecting telescope. Corrector plate: A full aperture negative lens placed before a primary mirror designed to correct the optical aberrations of the mirror. Schmidt corrector plate: An aspheric-shaped corrector plate used in the Schmidt telescope.
Newtonian telescope design. A Newtonian telescope is composed of a primary mirror or objective, usually parabolic in shape, and a smaller flat secondary mirror.The primary mirror makes it possible to collect light from the pointed region of the sky, while the secondary mirror redirects the light out of the optical axis at a right angle so it can be viewed with an eyepiece.
The Astroscan had a Newtonian reflector layout with a 4⅛" clear-inch (105mm) diameter f/4.2 aluminized and overcoated borosilicate glass parabolic primary mirror with a focal length of 17½ inches (445mm). [1] The telescope's secondary mirror was mounted on a flat optical window at the front of
[1] [2] Secondary mirrors in the form of an optically flat diagonal mirror are used to re-direct the light path in designs such as Newtonian reflectors. They are also used to re-direct and extend the light path and modify the final image in designs such as Cassegrain reflectors. [3]
28-inch Refractor (1893) Thompson Telescope with a 26-inch refractor and 30-inch reflector on one mounting (1896) Lassell 2-foot Reflector (1845) Isaac Roberts 20-inch reflector (1885) Western Equatorial (c.1824) 13-inch Astrographic Refractor (1890) Merz 12.8-inch Visual Refractor (1859-1893) (this was replaced by the 28 inch Grubb in the ...
Newton describes a telescope with an objective concave primary mirror diameter of 2 inches (50 mm) 0.3 of an inch thick, ground to fit a sphere that was 25 inches in diameter giving it a radius of 12.5 inches and a focal length of 6.25 inches (158 mm). The mirror was aperture reduced to an effective aperture of 1.3 inches by placing a disk with ...
Schmidt–Newtonian telescope from Meade. Schmidt–Newtonian telescopes offer images with less coma than Newtonian telescopes of the same focal ratio (usually about half). ). The corrector plate also helps to seal the tube assembly from air currents, and provides mounting point for the diagonal mirror, eliminating the diffraction effects from a "spider" secondary supp
A Dobsonian telescope on display at Stellafane in the early 1980s. A Dobsonian telescope is an altazimuth-mounted Newtonian telescope design popularized by John Dobson in 1965 and credited with vastly increasing the size of telescopes available to amateur astronomers. Dobson's telescopes featured a simplified mechanical design that was easy to ...
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