There are telescopes that sell a 5 kilometer view

If you ask the wrong question, it is easy to be fooled when you buy a telescope like this, so it is better to understand the relevant knowledge of telescopes before deciding what telescope to buy.

For example, if we can see the moon 380,000 kilometers away with our naked eyes, but we can't see an ant 38 meters away, how do we define the concept of "how far to see"?

Whether we can see the object or not depends on the angle formed between the object and our eyes, the moon is far away, but the angle of view is large, so we can see; The ants are close, but the angle of view is small, so we can't see them.

The purpose of the telescope is to magnify the angle of view of objects in our eyes, so that we can see objects that cannot be seen because the angle of view is too small.

For example, binoculars with an effective magnification of 10 times can see a car driving 5 kilometers away, a human face 2 or 300 meters away, and flies dozens of meters away.

Regular brand handheld telescopes, the general magnification will not exceed 12 times, otherwise it will be too shaky to see the details, want to magnify the telescope is not suitable for hand-held use, must cooperate with the bracket.

There is no distance between a telescope and a telescope. It can only be pulled into the distance meter. If you buy a telescope that is ten times larger, and you look at 5,000 meters with the telescope, it is equivalent to looking at 500 meters with the naked eye. If you want to buy it, you can ask it. I'm from the Wheat Telescope.

Telescopes don't have a concept of how far they can see or how clearly they can see. An 8x telescope, as long as it is designed in accordance with the rules of optics, when observing a distant target through it, the angle of view of the target's image is magnified by 8 times, so that the target appears as if the distance has become 1 8 of the actual distance.

Observing a person at a distance of 100 meters with an 8x telescope makes the subjective feeling in the field of view feel like observing a person with the naked eye at a distance of only one meter.

500x80 is a standard marking method for telescope specifications, and its format is generally a multiple of the telescope's objective aperture, which is an important indicator when selecting a telescope. In addition, the telescope may also be marked with a field of view n 1000 m, which means that an object n far away can be placed in the field of view at a distance of 1000 meters.

Telescope specifications and models

For example, 7x35 indicates that the mirror is 7x, and the objective lens aperture is 35mm.

The representation method of a continuous zoom telescope, 8-24x40, indicates that the magnification of the mirror can be continuously varied from 8x to 24x, with an aperture of 40mm.

The representation method of the variable magnification telescope, 30+60x70, indicates that there are two kinds of magnifications, 30 times and 60 times, and the aperture is 70mm.

But for astronomical telescopes.

It is customary to use aperture and focal length to express specifications, such as 80 600, or 80f600, which means that the objective lens aperture is 80mm and the objective focal length is 600mm.

Astronomical telescopes can also be directly marked with apertures, such as 80mm, 102mm, 127mm, 153mm, etc., or according to the imperial system: 4 inches, 6 inches, 8 inches, 10 inches, 12 inches, etc.

Hello, telescopes are available for sale in many places. There are a few places where you can buy a telescope:1

Professional Telescope Shops: These stores specialize in selling various types of telescopes, including astronomical telescopes, outdoor telescopes, and more. You can visit your local professional telescope shop to consult and purchase the telescope you need.

2.E-commerce platforms: There are many stores on e-commerce platforms such as Jingdong and ** that sell all kinds of telescope wheels.

Some large malls will also have dedicated outdoor areas where you can look for telescope brands and models, and then consult and purchase them with a salesperson. It is important to note that when choosing a telescope, you should choose the right model and brand according to your needs and budget. If you don't know much about telescopes, it is recommended that you know some basic knowledge of telescopes before buying, such as magnification, lens diameter, etc.

In addition, the telescope's ** will also vary depending on the brand, model, and function. You can choose the right telescope for your budget and needs. In addition, when buying a telescope, you can also pay attention to some after-sales service and warranty policies, so that you can get timely support and repair when needed during use.

Hope the above helps. If you have any other questions, please feel free to continue to ask them.

As long as the observed target is bright enough or large enough and has sufficient illumination, the observation distance can be arbitrarily far within the universe.

Moreover, "how far you can see" is not what a telescope does. A telescope simply magnifies the angle of view of any object indiscriminately – for example, if you look at a person at a distance of 100 meters through a 10x telescope, you will feel as large and clear as if you were looking at the person at a distance of 10 meters with the naked eye. Looking at a galaxy 1 million light-years away through the same telescope will feel as big and clear as if you were looking at it at 100,000 light sources with the naked eye.

As for the propaganda on some sales platforms that use large fonts to "this telescope can see x000000000000 meters", you can completely appreciate it with a look at bai-chi. That's a clumsy lie with no common sense at all, and when you don't have common sense either.

In the image above, as long as this mirror is used, any targets that are far away from the perigee of the Moon (the Sun + the seven planets of the solar system, all stars, all deep-sky objects) are not visible; You can't see the moon even when it's at apogee. Do you understand what an artifact is?

1. In fact, the telescope does not have the farthest viewing distance, and the usual "can see 2000 meters" and "can see 3000 meters" are actually false propaganda of some inferior products. Just think about it, I'll give you an example:

When the weather is good, you can see the moon 300,000 kilometers away with the naked eye without a telescope, and when the weather is bad and there is dust or fog, even with a telescope, you may not be able to see the traffic lights 200 meters away, right? Hehe.

So, there is no such thing as how far you can see – this has nothing to do with telescopes, it has to do with weather, air conditions, environment, etc.! Of course, the premise is that the regular telescope, the kind of inferior product produced by a small workshop, is itself blurry because of problems such as the accuracy of the parts.

2. Then you may have to ask, what is the difference between different grades? To be honest, there is no standard for this, but roughly speaking, this kind of thing is of different grades, according to different requirements, to customize the material grade and processing accuracy. It affects the effect, that is, the image quality, the clarity of the picture.

3. The telescope is mainly too many inferior ones on the market now, and this requires you to know more basic discernment knowledge. If you choose regular production, there will be no problem. The point is that there are too many inferior and counterfeit ones, and this one can be taken a look.

There is a lot of knowledge introduction in the back, from some identification knowledge, to the production of telescopes, materials, processing, lenses and other knowledge. You can take a look.

4. I don't know what your original intention of asking this question is, it won't be that you want to use astronomical scenery - astronomical telescopes, not suitable for ** scenes, if you are not an astronomy enthusiast, dispel this idea as soon as possible.

There are many differences between the design requirements of astronomical telescopes and those of the first scene. For example, there is no emphasis on edge sharpness, only center sharpness. The use of long focal length lenses makes the field of view very narrow, and general astronomical telescopes, because they do not use prisms inside, tend to be inverted, even if they add a positive mirror, in fact, it is reversed.

Therefore, in fact, astronomical telescopes are not suitable for ** scenery.

And now the so-called "astronomical scenery dual-purpose mirror" popular on the market should also be noted, this kind of product often has a very embarrassing situation, not very suitable for looking at the scenery, watching astronomy, is not very suitable. Neither side is taken into account. And because most of the zoom structures are used, the clarity is not good, and the field of view is extremely narrow.

Again, what is it, what is it used for.

1. At present, the farthest radio telescope in the world can see 10 billion light years, and 1 light year means that light travels at a speed of 300,000 kilometers per second for a year, and can see 10 billion light years away. However, we still haven't seen the boundaries of the universe, and science has not yet developed instruments that can see the horizon. The more famous ones are the Hubble Telescope.

2. How far can an ordinary telescope see? Generally speaking, the number of general tube viewing glasses is more than 7-10 times, one is more than 12 times, if the number is high, it will shake when held, affecting the observation effect, 10 times the telescope to see the scene at 100 meters, which is equivalent to 10 meters closer to the front of the eye (100 divided by 10 times, 7 times is equivalent to the feeling of closing to 14 meters) The feeling of the naked eye. The biggest difference with the camera function of the mobile phone is that it looks clearer than the mobile phone.

3. Generally speaking, the magnification of ordinary hand-held telescopes should not exceed 10 times, because there will be a slight shaking when holding the telescope. This is also the reason why the magnification of the military telescope nuclear mirror is generally only 7 or 8 times. For a telescope of the same aperture, the smaller the magnification of the field of view.

Therefore, it is recommended not to buy a high-powered telescope if you carry it with you.