They are usually designed for beginners who simply want to observe the moon and the planets without going too far into deep space. They do not fully correct for chromatic aberration.Īpochromatic, on the other hand, has better correction of chromatic and spherical aberration than the achromatic design. Starting with achromatic, these telescopes contain two lens elements. The two more popular designs are the achromatic and apochromatic. To correct for color fringing refractor telescope, designers can combine multiple lens elements. They do not do it as much as you see with a prism, but it is enough to cause color fringing. For example, blue light is bent more than red light. Shorter wavelengths of light are bent more than longer wavelengths. White light is a combination of all the colors of the rainbow.Ī single lens acts like a prism, breaking the light into component colors. Due to the properties of the materials used and the physical properties of light different colors of light bend at different angles. There is a problem with using a single lens to concentrate light. These use multiple lens elements in the primary lens to correct for issues caused be a single lens. There are two primary types of refracting telescopes achromatic and apochromatic. For more information on this, see our post that discusses focal length.Ī refracting telescope is the only design that uses only lenses to form images Types Of Refracting Telescopes For more information on the importance of aperture, see Why Is It Advantageous To Use A Large-Diameter Objective Lens In A Telescope?Īnother important telescope specification is the focal length that the primary lens provides. This allows for the viewing of dimmer objects and for greater magnification. The larger the aperture the more light is gathered. The most important specification is the telescopes aperture. ![]() The objective lens and eyepiece work in tangent to help the observer make more sense of what they are seeing so that they can easily analyze it. The smaller eyepiece lens, therefore, acts as a magnifying glass that enlarges the images of the larger front lens. The light then diverges a little just as it reaches the smaller lens (eyepiece) which magnifies the light so that you can see the object clearly. With the use of an eyepiece, the image can be magnified.Īs the light travels through the telescope, it reaches a point near the rear of the telescope where it focuses. This allows the objects in the night sky look much brighter when we see them through the telescope. A lens is a curved piece of glass or plastic that gathers and bends the light. Inside this is the large lens known as the objective lens. If you look at a refracting telescope up close, you will notice a thick cylinder at the front of the telescope. However, this doesn’t mean they aren’t still great for observing and analyzing astronomical objects. Refracting telescopes are wonderful instruments to observe and image the night sky. Many people will therefore see refractive telescopes as a more ‘old school’ type of telescope. These modifications were made to compete with improve function and resolve some issues. Refracting telescopes have kept the same basic design but have been improved upon. Galileo modified it so that it was more suitable for astronomy. With this telescope, he discovered and studied the moons of Jupiter. Soon after, Galileo learnt of the development. The Durch Lensmaker Hans Lippershey developed the prototype in 1608. Refracting telescopes were the first type of telescope invented. We will also discover why they are still so beloved after all these years! History Of Refracting Telescopes With that in mind, let’s take a deeper look at how a does refracting telescope work. This is especially so since they tend to be seen as a little more old-fashioned than many newer telescopes. ![]() That said, though, while they are still very popular, some people don’t know how refractor telescopes work. ![]() In that case, a refracting telescope is ideal for this role because of how it is designed and the extra pieces of equipment and devices that it uses. Suppose you’re someone primarily concerned with astrophotography or planetary observation.
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