Newtonian Mirror
The Newtonian reflecting telescope was invented by British scientist Isaac Newton in 1668. It uses a concave primary mirror, usually parabolic in modern designs, and a flat secondary mirror at 45 degrees to the optical axis. Light reflects from the primary toward a focus, then the secondary turns it by 90 degrees to form an image at an eyepiece on the tube's side. This avoids refractor chromatic aberration and is relatively inexpensive, particularly for large apertures, benefiting observation of faint deep-sky objects. Disadvantages include coma and the need for periodic collimation. Newtonian telescopes are popular for amateur construction and use and helped establish the basis for large professional telescopes. Dongkeda offers Newtonian systems in various apertures and magnifications, with coating options to improve performance and image quality, plus accessories and assembly services.
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