![]() spherical, paraboloid).Įarly reflecting telescopes were made from these designs using the speculum metal then usedįor regular mirrors. Several configurations ofĬonvex mirrors ,concave mirrors and lenses were proposed, some of which are still in use today.ĭifferent shapes were suggested for the mirrors (e.g. The reflecting telescope did not have these problems. ![]() This could result in fuzzy edges to objects. The problem is that glass refracts theĭifferent wavelengths of light differently, resulting in different focus Light rays at the objective to a single focus point. ![]() Interest were some very serious problems with early refracting telescopes. The Jesuit priest, Niccolo Zucchi,Įven built a crude reflecting telescope as early as 1616. Shortly after the invention of refracting telescopes. Interest in the idea of building telescopes using mirrors instead lenses began To the work that preceded them and that was being done by contemporaries. Understanding the contributions of Mersenne, or for that matter Newton, requires some attention Marin Mersenne presented workable designs for reflecting telescopes that are still used today.īut he was not the first to toy with the idea of using mirrors in place of the lenses of the telescope. By coincidence, all three were Roman Catholic priests. TheĮarly proponents of reflecting designs (Marin Mersenne, Bonaventura Cavalieri,LaurentĬassegrain) deserve a closer look. Histories of the reflecting telescope typically skip over theirĬontributions to start with Isaac Newton (1668) or James Gregory (1663). The earliest champions of this design published their designs 30 yearsīefore the debut of Newton's telescope. ![]() Over the last 120 years, almost all of the largest optical telescopes were reflecting telescopes The Early Reflecting Telescope:Cassegrain and Mersenne ![]()
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