Refracting telescopes are very rugged.Keplerian Refractors are also great for novice astronomers and are most commonly used. Though the Keplerian Refractor produces an inverted image, it is still preferred over Galilean Refractor as a larger apparent field of view is provided by the Keplerian Refractor. As a result, a horizontally and vertically inverted image is produced. Keplerian Refractor design produces an image using a bi-convex lens objective with an extended focal length and a bi-convex lens eyepiece placed behind the focal plane. Keplerian Refractor uses a convex lens in both objective and eyepiece. The main advantage of using the Galilean Refractor design is that we get an erect and true image in the left or right perception.īut if you pick up a relatively modern Refractor telescope, you will most possibly pick up a telescope constructed using the “Keplerian Refractor” design. An objective made out of a bi-convex lens and an eyepiece made out of a bi-concave lens are used to form a magnified image. The first refractor telescopes used the “Galilean Refractor” design. Refractor Telescopes first originated from Europe in the early 1600s. Refractor TelescopeĪs the name suggests, refractor telescopes rely on lenses and use the principle of refraction of light to enlarge an object and project the image on the eyepiece. Reflector telescopes are a little bit heavier in weight. A bigger Reflector telescope is feasible. A bigger Refractor telescope is not feasible. Image quality is relatively bad compared to reflector telescopes. There is no lens sag in the Reflector telescope. Lens sag is prominent in this type of telescope. No chromatic aberration is seen in the reflector telescope. Refractor Telescope Reflector Telescope Refractor Telescope suffers from chromatic aberration.
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