![]() ![]() Thereby a reflector needs to be three times the optical size of the refractor to achieve the same brightness. Why is a refractor the preferred telescope for astronomy & terrestrial spotting applications ? It’s simple – a refractor telescope achieves the maximum amount of light from it’s optics to the eyepiece, whereas the reflector telescope has light losses, reflectivity losses and light scatter (from it’s mirrors) which doesn’t apply to a refractor. You may find offers using a lower duty Az3 mount, which is incapable for astronomy – and suits exclusively birding low power applications – and fails to achieve the performance required for Astronomy. Note: The mount for this telescope is an “Astronomy Duty” Saxon Eq2 mount. Your browser does not support the audio element.BEGINNER & INTERMEDIATE TELESCOPE – Good quality introductory & Intermediate level telescope – Good performance on the moon, planets, stars, double stars & star clusters – also excellent performer for terrestrial spotting – ie: birding, landscapes, sea views, etc.Īvailable in stock, limited stock available.Īustralia’s Favourite First Telescope – The Saxon 909EQ2 – 90mm Refracting Telescope System is a telescope for Beginner & also Intermediate level astronomy, it is an exceptional performer and wonderful value. Listen to a recorded reading of this page:.Take a ten question quiz about this page.The largest refracting telescope in the world is located at Yerkes Observatory in Wisconsin.They control the telescope using computers over the internet. A lot of astronomers today work remotely from the actual telescope.Most observatories are built on mountaintops where the air is thinner and cleaner. ![]() The first telescopes were used by sea merchants and the military.The successor to the Hubble Telescope is the James Webb Space Telescope.This has enabled it to take some amazing pictures of far away stars and galaxies. Being outside the Earth's atmosphere allows the Hubble to view outer space without background light. This telescope was put into orbit around the Earth in 1990 by the Space Shuttle. One of the most famous telescopes in the world today is the Hubble Space Telescope. By using mirrors instead of lenses, Newton was able to make an improved telescope that did not suffer from some of the issues with the refractor such as chromatic aberration. In the late 1600s, Isaac Newton developed the reflecting telescope. Although this made the image appear upside down, it improved the usability of the telescope. ![]() Kepler used a convex lens for the eyepiece. The refractor was further improved by astronomer Johannes Kepler around 1611. Galileo made some improvements and first used the telescope for astronomy. The first telescope invented was a refractor invented by Dutch lensmaker Hans Lippershey in 1608. There are various designs of reflecting telescopes, but the original design by Isaac Newton is still popular today.Įxample of a Newtonian reflecting telescope In order to get the light out of the telescope, another mirror is used to direct the light to an eyepiece. A concave mirror is used to gather light and reflect it back to a focal point. Reflecting telescopes use mirrors instead of lenses to focus the light. This makes the object seem much closer than it really is. This lens takes the light from the focal point and spreads it out across the retina of your eye. This lens is a convex lens that bends the incoming light rays to a focal point within the telescope. The first lens is called the objective lens. The basic refracting telescope has two lenses. You can go here to learn more about the refraction of light using lenses. Refracting telescopes use lenses to bend the light to a specific focal point such that the object will be magnified to the viewer. These telescopes are called reflecting telescopes. The other type uses mirrors to focus the light of the image. Telescopes that use lenses are called refracting telescopes. One type uses lenses to magnify the image.
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