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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.
LXD75, including Newtonian, Schmidt-Newtonian, Advanced Coma-Free, and achromatic refractor telescopes; ETX-LS, 150mm (6 in) and 200mm (8 in) F/10 ACF telescope on a single-fork arm with integral GPS and 'Eclips' camera for self-alignment. DS-2000 Series, 80mm (3.1") refractor, 114mm (4.5") and 130mm (5.1") reflector on altazimuth Goto mounts
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 ...
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
An Astroscan wide-field Newtonian reflector. The Astroscan was a wide-field 4⅛" clear-inch (105mm) diameter reflecting telescope, originally produced by the Edmund Scientific Corporation, that was for sale from 1976 to 2013.
Examples of sub-aperture corrector catadioptric telescopes include the Argunov–Cassegrain telescope, the Klevtsov–Cassegrain telescope and sub-aperture corrector Maksutovs, which use as a "secondary mirror" an optical group consisting of lens elements and sometimes mirrors designed to correct aberration, as well as Jones-Bird Newtonian ...
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