A wonderful gift for a child and not only: spotting scope
With the abolition of the Russian school of astronomy fewer and fewer graduates know anything about the stars. But not always solve all knowledge, as people still like to look at the stars that still beckon to its unfathomable romance. The only thin thread that maybe a little bit to bring us closer to these lights is spotting. Few people have not dreamed in his childhood of a real telescope through which could be seen every star and planet. You have the chance to fulfill this dream if not for yourself then for your children: buy a telescope for them.
How to choose?
To the uninitiated in the intricacies of optics is not easy to understand the structure of even simple binoculars, not to mention such a complex device like a spotting scope. But the point is that when it is selected not necessarily so much to know. Any telescope has several key features: lens diameter, magnification and exit pupil diameter.
In the instructions for any chosen model, you can find the PostScript, for example, 10×30, where 10 is the magnification and 30 is the lens diameter. From the multiplicity depends primarily on the range and quality of the review, but chase is too high performance is not necessary, as the higher the ratio, the lower the stability of the picture. As a result, while too large ratio of your telescope will simply smeared image.
In order to compensate for this error, use a larger diameter lens. Accordingly, the higher it is, the more light it gets, and the clearer the visibility of distant objects. Try to choose such ratios, in which the diameter of the lens not less than three to four times higher than multiplicity. Depends on the following quality indicator.
Exit pupil diameter is nowhere indicated, but the size can be determined by dividing 30 by 10 (the second number on the first). In the result we get is 3 mm, what will be the measure of the exit pupil. Optimal size should be no greater than 4.25 and not less than 3.50 mm, otherwise your spotting scope will give a high-quality image of observed objects.
The most popular among both professionals and Amateurs are spotting scopes Yukon. The firm supports the balance between price and quality, offering the most reasonable price for the different options. Of course, there are many other firms, but why risk the quality or overpay for a big name?
Don't be fooled! Does not exist telescopes for observing the sky at night: too little light for that image was a little clearer. However, the sellers of shops quite often try to play on the inexperience of their buyers, listing obviously non-existent function. Always carefully study the technical specifications of the device and not overpay for unnecessary stuff.
Now that you know how to choose a good telescope, it is time to act. And remember that spotting is not just a tool, that's what you remember yourself a child, fulfilling his cherished dream. In addition, you give your children the opportunity looking at the sky, to dream of the unattainable, the great and beautiful!