Once the object is centred, then change to a higher magnification eyepiece to see more detail. Therefore, when first trying to centre an object in a telescope, it is best to use the eyepiece with the lowest magnification so that the biggest area is available in which to find the object. The thing to note is that as the magnification is increased, the viewing area of the telescope is decreased. Some telescopes come with a variety of eyepieces so that you can change the magnification. The arrangement of the optics (eg the lenses and mirrors) can make the light ‘fold’ in on itself, bringing it to a focus without having to travel the full-length of a long telescope tube as required by traditional telescopes.įor all telescopes, it is the eyepiece that determines how much an image is magnified. These telescopes are typically short and stubby and this compact design makes them easy to transport and handle. They combine both lenses and mirrors to focus the light towards the eyepiece. Catadioptric telescopes were invented in the 1930s and are the most modern design of telescopes.the mirrors or lenses) then the image created will appear warped or out-of-focus and blurry. If there are any flaws in a telescope’s optics (eg. Mirrors are lighter than lenses and they are also easier to shape into a smooth and perfect surface. They use mirrors to collect and focus the light towards the eyepiece. Reflecting telescopes are sometimes called Newtonian telescopes after their inventor Isaac Newton who built the first one in 1668.The astronomer, Galileo, was the first person to observe the night sky with a telescope, discovering the craters on the Moon, the rings of Saturn, and Jupiter’s four largest moons (Io, Europa, Ganymede and Callisto). They have a curved lens at one end that focuses the light down a long tube towards a second lens, called the eyepiece, which magnifies the image.
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