Newton s Reflecting Telescope Essay - 1241 Words

1666 -- After studying the reflection of light through prisms, Sir Isaac Newton
decides that the problem of chromatic aberration cannot be solved. He
makes an improved version of the reflecting telescope.

Newton's Reflecting Telescope Essays

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Refracting Telescope - WriteWork

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therefore he constructed a reflecting telescope

In a Newtonian reflecting telescope, light rays from distant objects, which are essentially parallel (because they come from so far away), strike the concave main mirror at the same angle. The rays are then reflected back up through the telescope tube toward the focal point. However, before they reach the focal point, they strike a secondary, flat mirror that is tilted at a 45-degree angle. The secondary mirror diverts the light out through a hole in the side of the tube. The eyepiece lens then focuses the light. This produces a magnified image. Also, the image appears much brighter than it does to the naked eye because the mirror gathers and concentrates the light.

Although this was very basic it was the first refracting telescope in ..

History of the telescope - Wikipedia

Among the catadioptrics, the Maksutov Cassegrain has justifiably earned a solid reputation as an excellent high resolution telescope. The Maksutov design combines a spherical mirror with a longer native focal length (slower f/3 relative aperture) than a typical Schmidt Cassegrain (f/2) with a weakly negative meniscus lens in a design that takes advantage of all the surfaces being nearly spherically symmetrical. The negative lens is usually full diameter and placed at the entrance pupil of the telescope (commonly called a corrector plate or meniscus corrector shell). The design corrects the problems of off-axis aberrations such as coma found in reflecting telescopes while also correcting for chromatic aberration. It was patented in 1941 by Russian optician Dmitri Dmitrievich Maksutov after a five year spell of careful ray tracing and prototype building, which culminated in the first working model produced in the autumn of the same year. He based his design on the idea behind the Bernard Schmidt’s camera, which used the spherical errors of a negative lens to correct the opposite errors inherent of a spherical primary mirror. Because the design utilises all-spherical elements, it greatly aids in mass fabrication.

This reflecting telescope which had a 60-centimetre ..

Despite these innovations it is arguably the range produced by Orion (USA) and SkyWatcher that has made most heads turn in the Maksutov camp in recent years. Following fast on the heels of the better established small companies, Synta churned out an exciting suite of Gregory Maks in the 90mm – 180mm range which could be purchased as complete packages including a mount or as optical tube assemblies. Over the last six months or so, I have been carefully evaluating an Orion re-branded version of Synta’s 180mm model – the telescope that has really opened my eyes to the tremendous versatility of the Maksutov design as a visual instrument.

One of the most watched telescopes on eBay is a TINY 76mm Newtonian reflector

Refractor Telescope Diagram, Refractor, Wiring Diagram And C

Since first beginning my assessment of this large Gregory Maksutov, I have been made aware of two independent tests, both of which suggest that the optical quality of this telescope is very high.

NASA named the world's first large, space-based optical telescope after American astronomer Edwin P


Shortly after the launch of the ETX 90, Meade introduced two larger instruments from the same family – the ETX 105 and the ETX 125. I spent a considerable time looking through the 125 and can vouch for the razor sharp optics on these units when conditions allow.
Meade also produced a 7inch (178mm) f/15 Gregory Mak as part of their highly successful LX-200 series of computerised telescopes which received very high praise from discriminating lunar and planetary observers who raved about their apo-like optics. These telescopes are now considered highly collectible classics from the late 20th century.

Kids learn about telescopes in the science of physics including lenses, mirrors, refracting, reflecting, the history, and the Hubble Space Telescope.

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While each successive generation of telescopes has revealed more of the Universe than we could have imagined existed, it seems somewhat strange that the exact origin of the optical telescope is in doubt. What is