How to Choose a Telescope

How to Choose a Telescope

How to Choose a Telescope - Tips for Choosing a Telescope - Different types of Telescope | Tips on - Find TipsAlthough, we are enchanted by the beauty of a starry night, but we could hardly view the real images of the celestial objects with our unaided eyes. Without the help of a telescope, we can hardly see the rings of Saturn, the moons of Jupiter or distant galaxies.

Once you step inside a telescope store, you will be baffled by the large number of telescopes that are available there. However, despite their different dimensions and details, there are two basic models of telescopes – the reflecting telescope and the refracting telescope.

Reflector or Reflecting Telescope
Sir Isaac Newton invented the reflector telescope. A reflector telescope uses a curved mirror for collecting the light from the distant object. The models of the reflector telescopes that are currently available are an advanced version of the original Newtonian telescope. The telescope has two mirrors – the primary mirror and the secondary mirror. The light from an object travels through the telescope tube to strike the primary mirror. From the primary mirror, the light rays are then reflected back to the secondary mirror, which is placed at a 45-degree angle up the tube. The light reflected from the secondary mirror comes out of hole to form an image of the object, which subsequently is magnified by the eyepiece.

Refractor or Refracting Telescope
In this telescope model, the parallel rays of light pass through a curved lens, which is known as the objective lens. The objective lens causes the light rays to converge towards a point to form an image of the distant object. The image produced by the lens of the telescope is magnified by the eyepiece.

Focal length of the telescope
The focal length of the lens or the mirror is the distance between the lens or the mirror and the point where the light rays converge to form the image. The ratio between the focal length and the diameter of the main lens of the telescope is the focal ratio. To watch the planets of the solar system, you should opt for telescopes with long focal lengths, which have narrow fields of vision, suitable for viewing details. However, to watch the deep sky objects, you should choose Rich Field telescopes, which have focal ratio between four or five. The observing field of these telescopes is wide.

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