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Refracting telescope
Reflecting telescope
The first reflecting telescope built by Sir Isaac Newton in 1668 [ 3] is a landmark in the history of telescopes, being the first known successful reflecting telescope. [ 4][ 5] It was the prototype for a design that later came to be called the Newtonian telescope. There were some early prototypes and also modern replicas of this design.
Newtonian telescope
The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture. This design puts the focal point at a convenient ...
Great refractor refers to a large telescope with a lens, usually the largest refractor at an observatory with an equatorial mount. The preeminence and success of this style in observational astronomy defines an era in modern telescopy [ 1] in the 19th and early 20th century. [ 1] Great refractors were large refracting telescopes using ...
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