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4.5-inch (110 mm) LightBridge Mini 114 Dobsonian. Schmidt-Newtonian telescopes (6 to 10 inches). LightBridge Dobsonian telescopes (currently 8, 10, 12 and a 16-inch model) Meade Model 4504: 4.5-inch (110 mm) equatorial reflecting telescope
An Astroscan wide-field Newtonian reflector. The Astroscan was a wide-field 4â…›" clear-inch (105mm) diameter reflecting telescope, originally produced by the Edmund Scientific Corporation, that was for sale from 1976 to 2013.
Edmund Scientific Corporation, based in Barrington, New Jersey, was founded in 1942 as a retailer of surplus optical parts like lenses.It later branched out into complete systems like telescopes and microscopes, and in the 1960s, a wide variety of science toys and kits.
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 ...
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.
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
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