Before we look at our telescopes for sale let us consider different instruments and how your telescope works?
Our telescope can show you wonderful things and take you incredible distances across the universe. To understand it, you must know that a telescope is a “creature of light” Light is the medium of vision, one of the most important of the five senses (vision, hearing, touch, smell, and taste) that we use to gather information about our environment. On a clear night, some of the light from the heavens will reach your telescope, and your telescope will “process” this light to direct an image to your eye. Here is how that light works –
Light:The Signature of the Universe Visible light is a form of energy called electromagnetic (or radiation (which also includes invisible energy, such as radio waves and X rays). Unlike other forms of radiation, our eyes recognize only visible light. Light moves in waves, something like ocean waves. Stand on the shoreline with a stopwatch and time the number of waves that reach the shore every second. If one wave reaches the shore every second, the wave frequency is one wave per second. Next, stand in the surf with a yardstick and try to measure the distance between a wave crest and the crest of the wave following it. This distance is called the wavelength. .
The colour of the setting Sun:You can get a good feel for the variable-scattering effect of the Earth’s atmosphere by observing the colour changes of the Sun as it sets. By glancing indirectly in the direction of the Sun when it is high in the sky, you have of course noticed our star’s predominant yellow colour. As the Sunsets, its light travels through more of the Earth’s atmosphere and therefore is more affected by scattering. Therefore, the Sun seems redder just before it sets (or after it rises) than when it is higher in the sky. Of course, the blue photons scattered by the atmosphere do not just disappear. While scattering makes the Sun “redder,” the day sky gets “bluer” but even those photons that reach the Earth’s surface are not unaffected by their passage through the Earth’s atmosphere. When light leaves one medium and enters another (say from space into or air into water), its velocity changes and its path is bent, or refracted. Light slows down as it goes from space into it slows again if it enters water or glass.
Observing Refraction:One way of observing refraction is to pitch coins into an aquarium or swimming the trajectory (or path) of a coin seems to change when it enters the water. If you have an aquarium, notice how a fish’s position seems to change when it is viewed from above and from the side.
How Your Telescope Works:If you have a good sky view to the western (or eastern) horizon, you might be able to observe the setting (or rising) Notice how the Sun’s image seems to spread out from a sphere into a when it is close to the horizon. This effect occurs because light from the part of the Sun near the Earth’s horizon travels through more atmosphere than light from the parts of the Sun that are higher in the sky. Light rays near the horizon experience more bending by refraction.
Refractors:A refractor is a telescope that uses lenses alone to magnify objects. It is a modern version of the first astronomical telescopes used by Galileo. The large objective lens collects light from a distant object and delivers this light beam to the eyepiece, the lens or set of lenses at the hack of the tube. The eyepiece then focuses the light on your eye. If the image is properly focused and the optics are properly aligned, you will observe a bright and distinct image of the celestial object.
Reflectors:A Newtonian reflector, the earliest type of reflecting telescope, uses lenses only in the eyepiece. Most of the work is done by mirrors. Light is collected by a curved Primary mirror. A flat secondary mirror, which is much smaller than the Primary mirror, directs the collected light to the eyepiece. Early reflectors were large and hard to work with. in 1672, an obscure French man named N. Cassegrain designed are reflecting telescope with a curved secondary mirror. Many large and small modern telescopes use Cassegrain’s approach to bend the light further. These telescopes are more compact than many Newtonians of the same primary mirror diameter.
Our aim is to provide you with the right telescope at the right price, whilst offering a good range of accessories and combination packages at competitive rates. We believe our telescopes represent high levels of manufacturing specification from well established sources and all incorporate features...
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