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Anonymous users2024-02-07There are many types of telescopes in the domestic market, which is dizzying. However, it can be divided according to the following aspects: according to the different places of origin, there are foreign (the United States, Germany, etc.), domestic (Guangdong, Zhejiang, Sichuan, etc.); Adventure brands are divided into different brands, including Xianlifu, Baolong, Debao, Sakura, Kengao, Golden Triangle, etc., which are divided according to different uses, including variable magnification mirrors, waterproof mirrors, and night vision goggles; According to the different magnifications, there are low magnifications (2 5 times, more common in toy products), medium magnifications (7 10 times), and high magnifications (15 70 times).
First, if you want to travel at sea or by the sea, don't forget to buy a waterproof telescope (especially the Turvo Offshore Series 7 50mm waterproof telescope made in the United States).
Second, if you want to go out sightseeing, you can buy a small telescope with zoom function.
Third, if you plan to go to dangerous areas where you can see from afar but not up close, you should buy a high-magnification telescope.
Fourth, if you want to hunt or travel for a long time, it is best to buy a zoom telescope, and explain how to use it. Because variable magnification telescopes can be gradually adjusted from low power to high magnification, they should be used for a rough search with a low magnification and large field of view, and then a careful observation with a high magnification and a small field of view.
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Anonymous users2024-02-06Aperture The aperture of the telescope refers to the effective aperture, that is, the diameter of the lens exposed to the outside, the aperture is generally expressed by d, the larger the aperture, the greater the luminous flux, the weaker the target can be seen, and the shorter the exposure time required when used for celestial photography.
Relative aperture refers to the ratio of the effective aperture d to the focal length f, denoted by a:
a=d f magnification The magnification of a telescope refers to the angular magnification, which is equal to the ratio of the focal length of the objective lens to the eyepiece:
g = f where f is the focal length of the objective lens and f is the focal length of the eyepiece. The greater the magnification of the telescope, the smaller the field of view.
Field of view If you use a telescope **sky, then the angular diameter of the part of the sky you see is called the field of view of the telescope. Denoted by . For the same telescope, the field of view is related to the focal length of the eyepiece, and the shorter the focal length, the smaller the field of view.
Resolution angle The resolution angle of a telescope refers to the angular distance between two points that its image point is just able to resolve.
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Anonymous users2024-02-05You can buy ordinary binoculars for 100-200 yuan. Buy a *** point, you can see it clearly. You can't buy an astronomical telescope, for an astronomical telescope, the distance of 400 meters is a bit close, and the imaging is not very good.
1. When people buy telescopes, it is common to have several Arabic numerals on the price list, so what technical parameters do these numbers illustrate? Let's give an example of an interview. For example, it is marked with 10 50 mm 5°, which means that it has a diameter of 50 mm and a field of view of 5 degrees (i.e. at 1000). >>>More
The angular diameter of the area of the sky that can be well imaged by the telescope is called the field of view of the telescope or the angle of view of the field of view ( ) The field of view of a telescope is often determined at the time of design. The field of view of a telescope is inversely proportional to magnification, and the greater the magnification, the smaller the field of view. Different optical systems, different imaging qualities (due to aberrations), different apertures, and different focal lengths determine the size of the telescope's different fields of view (in the case of astrophotography, the size of the negatives or CCDs also constrains the size of the field of view). >>>More
One day in the early 17th century, Hans Lippershey, the owner of an optical shop in a small Dutch town, in order to check the quality of the polished lens, arranged a convex lens and a concave mirror in a line, looked through the lens, and found that the church spire in the distance seemed to be getting bigger and closer, so he accidentally discovered the secret of the telescope. In 1608 he patented a telescope he had made, and in compliance with the authorities' request, he built a binocular. It is said that dozens of opticians in the town claim to have invented the telescope, although it is generally believed that Lieberch was the inventor of the telescope.
Summary. Hello! When choosing a good astronomical telescope, there are several factors to consider: >>>More
Beijing Galaxy Telescope Answer:
The gap between astronomical telescopes is very large, and our ordinary junior astronomy enthusiasts can choose non-professional mirrors (professional mirrors are very expensive, and they are generally used for professional observation). **In the 1000-2000 yuan or so low-end astronomical telescope can be, of course, if you are very passionate about astronomy, for the observation effect of high requirements, you must choose the high-end telescope, refraction and reflection have their own advantages and disadvantages, mainly depending on what you want to observe, choose the best one for yourself; >>>More