A wonderful gift for the child and not only: the telescope
With the abolition of astronomy in Russian schools, less and less graduates know at least something about the stars. But not always everything is decided by knowledge, as people still like to look at the stars, which still beckon with their incomprehensible romance. The only thin thread that can bring us a little closer to these luminaries is the telescope. Few people dreamed of a real telescope as a child, through which every star and planet could be examined. You have a chance to realize this dream if not for yourself, then for your children: buy a telescope for them.
How to choose the right one?
To the uninitiated in the subtlety of optics it is not easy to understand the device of even simple binoculars, not to mention such a complicated device as a telescope. But the point is that when you select it, you do not need to know much. Any telescope has several main characteristics: the diameter of the lens, the magnification and the diameter of the exit pupil.
In the instructions for any model you choose, you can find a postscript, for example, 10 × 30, where 10 is magnification and 30 is the diameter of the lens. The range and quality of the review depends primarily on the multiplicity, but it is not worth pursuing too large indicators, since the higher the multiplicity, the lower the stability of the image. As a result, if the magnification is too large, your telescope will simply smudge the image.
In order to compensate for this error, a larger diameter of the lens is used. Accordingly, the higher it is, the more light it gets, and the sharper the visibility of distant objects. Try to choose such ratios, in which the lens diameter is not less than three to four times higher than the multiplicity factor. The next quality indicator depends on this.
The diameter of the exit pupil is not indicated anywhere, but its size can be determined by dividing 30 by 10 (the second number by the first). As a result, we get 3 mm, which is the indicator of the exit pupil. Its optimum size should be no more than 4.25 and not less than 3.50 mm, otherwise your telescope will not produce a high-quality image of the observed objects.
The most popular among professionals and amateurs is the Yukon telescope. This firm supportsbalance between price and quality, offering the most reasonable price for these or other options. Of course, there are many other companies, but why risk the quality or overpay for a big name?
Do not let yourself be deceived! There are no telescopes for observing the sky at night: there is too little light for the image to be a little crisp. Nevertheless, shop sellers often try to play on the inexperience of their customers, listing the obviously non-existent functions. Always carefully study the technical characteristics of the device and do not overpay for unnecessary trifles.
Now that you know how to choose a good telescope, it's time to act. And remember that the telescope is not just a tool, it's something that you yourself remember your childhood by fulfilling your cherished dream. In addition, you will give your children the opportunity, looking at the sky, just dreaming about the unattainable, great and beautiful!