[Q&A] How far can a telescope see?

Comprehensive answer

How far can a telescope

?Travel Telescope with Carry Bag Phone Adapter and Wireless Remote

see? I believe that this question should be the most concerned issue for most people. Many people have misunderstandings about this issue. For example, they think that the higher the magnification, the farther they can see, and there are many factors that affect how far a telescope can see. The following is a detailed explanation:

The distance seen by the telescope is related to human vision, such as the letter on the eye chart: ‘E’ is placed on 5 During the meter distance test, people with good eyesight can see the bottom line, and people with short-sightedness may only see the big ‘E’ in the first few lines. If you put the eye chart at a distance of 50 meters and use a 10 times telescope, it is equivalent to zooming in 10 times (same as 5 meters away). People with good eyesight can still see the bottom line, and people with short-sightedness can still only see the big ‘E’ in the first few lines, and the bottom line is still unclear. People who are short-sighted will say that the telescope cannot see 50 meters, and even the letters at the bottom cannot be seen clearly, while people with good eyesight will say that the telescope is very good, and even the E at the bottom of the eye chart at 50 meters can still be seen clearly. . Can you say that this telescope can only see 50 meters?

The distance the telescope can see is related to the size of the object. For example: there is an ant at 1000 meters. If you use a 10 times telescope, it is equivalent to zooming the ant to 100 meters to see it. You will definitely still not be able to see it. Can you say that this telescope cannot see 1000 meters? If there is a person at a distance of 1000 meters, if you use a 10 times telescope, it is equivalent to zooming the person to a distance of 100 meters to see, you must see clearly. The letter on the eye chart: ‘E’ When the test is placed at a distance of 5 meters, people with good vision can see the bottom line, and people with short-sightedness may only see the big ‘E’ in the first few lines. because of what? It is because the ‘E’ below is too small. With a telescope, you can clearly see the moon’s ring mountains at a distance of 380,000 kilometers, but you can’t see the Earth’s satellites that are much closer to us. This is the truth.

How far a telescope can see is related to air quality. For example, with the same telescope, the same person observes a billboard at a distance of 1000 meters. After rain and sunny weather, you can clearly see the small characters on the billboard. On a cloudy day without the sun, with car exhaust and dust in the air, it may not be clear. Going a step further, if there is fog, that is, there is a lot of suspended particles in the air, and visibility is reduced, you may not be able to see even 5 meters. That’s why foggy weather blocks highways.

With the improvement of people’s living standards and the heating up of outdoor tourism, telescopes have increasingly become one of the must-have equipment for outdoor tourism. one. But how to choose a suitable telescope for your use has become a very distressing thing for many people.

Reference answer source source website: [Baidu knows] What is the farthest distance a telescope can see?

The claims that the telescope does not see far, such as some so-called 3 kilometers and 5 kilometers, are all used as misleading propaganda by businesses, and regular products and occasions will not be advertised in this way.

Source website: [Baidu Knows] How far can a telescope be seen?

There are actually two indicators to measure the performance of a telescope: limit magnitude and resolution. The former shows how faint objects the telescope can see, and the latter shows the smallest detail the telescope can resolve. The former is related to the light transmission area of the telescope, and the latter is related to the effective aperture of the telescope.

Source website: [Baidu Knows] Can a telescope see people at 20 kilometers?

Your eyes What it can see, it can see and magnify for you. However, what the eyes cannot see is like the expression of a person 20 kilometers away. The existence of air and particles determines that the light of these details cannot be transmitted to 20 kilometers away, so it cannot be seen with a telescope.