People who are fond of astronomy, are often faced with the need to buy a telescope.How to choose an optical device?This question is quite complex.But we must remember one simple thing - you'll never find the device with which it would be possible to carry out absolutely all types of observations.That is why it is important to decide at the beginning, what you are buying a telescope.
How to choose it on the basis of existing varieties?The first version - a refractor.This optical instrument that uses light for collecting lens system.Its advantages are: it is able to last for a long time, has a large value of the field of view, stable centering, loss of light in this case is the smallest, as auxiliary surface between the eyepiece and the lens are absent.The image quality in such a device is high, and we can talk about a good protection against dust.But if you are interested in how to choose a telescope for beginners, it is important to mention the shortcomings refractors.This chromatic aberration, that is, image clarity may be reduced, as well as the appearance of color contours, spots, stripes.Relative aperture in this case is small, which means a small aperture ratio.And the main disadvantage - a decent size.
reflector situation is different.This second type of telescope.The advantages of: lower price, compactness, and hence mobility, a large aperture and a full chromatic.But there are also disadvantages, which has such a telescope.How to choose it, and whether, if it is increased sensitivity to the deformation of the mirrors, which, incidentally, are short-lived and in the use of darker, why spoil the picture?When carrying such a device is easy to mess up.And the observation of terrestrial objects image will be inverted.
If we talk about the scope of application, the refractors used when observing planets, the moon, ground objects and reflectors - deep-sky objects, that is, clusters, nebulae, galaxies.So decide how to choose a good telescope, based on the goals.
Another type data from optical instruments - mirror-lens.They also differ in their strengths.First of all, it is a compact, achromatic, the image is good across the breadth of vision, and they are protected from dust enough, because of their tube is sealed.The disadvantages include the high price many decent weight, considerable light losses.
You have to buy a telescope.How to choose it, and prompt many characteristics.For example, focal length, aperture, the penetrating power, resolution and so on.
Before you make a purchase, ask yourself some questions: what exactly do you plan to watch, where a sum of disposable?Beginners are better suited refractor, because you learn is likely to be the planets and the moon.Please note, the room in which to place your telescope.If it's small balcony, then you need to choose the reflector.And in the case with a spacious balcony and is suitable refractor.Prices for such optical devices range from $ 15 and as much as ten thousand.The most popular telescope CELESTRON, STURMAN, KONUS, and so on.
