As for the landlord, I don't know much about binoculars. Please think twice if you want to buy binoculars. The bazaar will become a decoration.
Regardless of the magnification of the telescope, the focal length of a telescope with a diameter of 60mm is generally 700mm, that is, 60/700. The first number refers to the aperture and the last number refers to the focal length. These two parameters determine the performance of the telescope.
Let's talk about magnification first. I searched Taobao for the explanation of telescope magnification.
For example, a celestial body 100 light-years away uses a magnification of 50 times, just like it is outside the light-year measurement. If you use the magnification of 100 times, it is like being outside the light-year measurement. " If so, the larger the magnification, the better. As long as the magnification becomes infinite, distant celestial bodies are as attractive as before.
Unfortunately, this is not the case.
The magnification of a telescope is actually the field of view. If the original field of view of the telescope is 50 degrees, now I use 50 times magnification, and now its field of view becomes 1 degree. If I use 100 times magnification, the field of view becomes 1 degree. The larger the magnification, the larger the field of view, and new stars will not appear in the field of view because of the larger magnification.
Therefore, the amplification of the above-mentioned business promotion is completely deceptive.
Magnification only enlarges the field of vision, not the distance of the observed object. Moreover, if the magnification is too large, the imaging quality will be poor. Ordinary public astronomical telescope, the magnification is below 100 times.
It is suggested that the landlord carefully consider whether to buy a telescope. Even if he does, my suggestion is to buy a small-caliber telescope, such as tube wave 60/700 refraction (looking at a simple celestial body).
Personally, I think there are two reasons. First of all, such a telescope is more than enough for observing astronomical phenomena that are easy to observe. Although such a telescope is small, its skill cannot be underestimated. In addition to the moon, such a telescope can also see the profits and losses of Mercury, Venus, the Martian canopy, the Muxingyun Belt, Saturn's rings, Uranus and Neptune, and hundreds of deep-space celestial bodies (1 10 on the messier objects table are completely visible.
In addition, such a telescope is small in size, easy to carry and can be easily taken out of the city. You know, the observation effect of small telescopes outside the city is absolutely no less than that of telescopes with much larger caliber in the city.
But I suggest the landlord think twice. After understanding the basic astronomical knowledge, before deciding whether to appreciate the more beautiful sky, it is better to learn astronomical knowledge first, because I am a little worried that some people are only interested in astronomy for a while, and observing the starry sky requires certain astronomical knowledge (for example, some must be mapped), and perhaps not everyone can persist, and the difficulties can only be deeply understood by personal experience.
If the landlord must buy it, I suggest buying a refractor. See my answer for the reason.
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I still hope the landlord can think it over carefully and don't regret spending the money at that time.
As for the brand, I admire Guanbo, because this brand is famous, the quality of mirrors is not bad, there are many service points, and after-sales service is more convenient. Phoenix may be almost there.
Finally, one more word, it is suggested that the landlord go to the manufacturer's website to look at the telescope, or go to several larger astronomical forums to communicate. Taobao lamp website is not completely impossible, but some businesses above can publicize some incorrect knowledge for sales (the most typical is amplification). If they don't have certain astronomical knowledge, they may fall into the trap and buy a telescope that is not particularly suitable for them.