Are you looking to buy a telescope? Before launching your research towards such a model or such seller, take a little time to understand the operation of these instruments and familiarize yourself with the criteria of choice.
Telescopes, glasses are the instruments of astronomy are varied. Here, some examples of instruments in a budget of around $ 130 to $ 400: two azimuth glasses of 70 mm, an equatorial telescope of 80 mm, an equatorial telescope of 130 mm, a table Dobson telescope of 100 mm. so when you are purchasing the Best Telescope For Viewing Planets And Galaxies then you can follow the best.
Is there an ideal telescope to get started?
Not really, because it’s always a compromise between performance, ease of use, observation preferences, size and budget of course.
Take a little time to learn the basics and ask yourself the right questions. When you have determined the type of instrument that suits you (or that will please a loved one whose aspirations you have tried to gauge), you will feel more comfortable making your choice.
Whether it is a telescope or a telescope, an astronomical instrument includes:
An optical tube: the main part of the instrument, responsible for forming images of the stars;
A mount which supports the optical tube and makes it possible to orient it in a precise direction; the mount is generally associated with a tripod;
Accessories: the most essential are the eyepieces and the researcher (or pointer).
All of these components must be carefully considered before making your choice because a good optical tube will be difficult to use if the frame is unstable and imprecise. It must also be well equipped with quality accessories, delivered original or purchased separately.
Now let’s talk about each constituent
The optical part
The optical part of an astronomy instrument has two roles:
Amplify the light received from the stars and thus reveal what the naked eye cannot see because of its lack of sensitivity (example: a distant galaxy).
Magnify the objects observed to reveal small details invisible to the naked eye (craters on the Moon, rings of Saturn).
Telescope or telescope?
These two types of instrument work in a similar way but are designed differently:
- The telescope’s main optical part is an objective, that is to say a lens (or group of lenses) placed at the front of the instrument.
- The telescope is based on a mirror placed at the back of the instrument.
- Note: some use the word telescope even in the case of a telescope (we then speak of a refracting telescope for a telescope and a reflective telescope for a mirror telescope).
Photo showing the difference between an telescope and a telescope
On the left an astronomical telescope whose objective is visible at the front of the tube. On the right a telescope whose centerpiece is a mirror, visible at the bottom of the tube.
Principle of the telescope
The light coming from the stars passes through the lens of the telescope and is concentrated at a point where we place a kind of magnifying glass called eyepiece . It is the eyepiece which makes the image of a star observable by the eye, with a more or less strong magnification. To prevent the observer from twisting his neck when the instrument is pointed towards the sky, an angled gear is placed just before the eyepiece to deflect the beam at 90 °.