How far can an 8X40 telescope see

Hello, I am in the optical industry, first of all, I ,—— about how far away the scenery can be seen, this statement is not standard, and most occasions are used by businesses as misleading publicity, formal products and occasions will not be so promoted. For example, some so-called "telescopes that can see 1 km" and "telescopes that can see 5 km".

For example, with my eyes, when the air is good and clear, I can directly see the moon 300,000 kilometers away, and with a telescope, I can also see the crater above. However, when the air was dusty, I couldn't even see the traffic lights 200 meters away.

In other words, a telescope, in fact, is what it is like - what your eyes can see, it can see, and it magnify for you! It's as simple as that. And what is the quality of the enlarged picture?

Of course, the clarity of a telescope with high precision will be better. You can take a look at these aspects.

After reading what I said, you may understand that what really determines the distance is actually the environment. Telescopes, which are only responsible for magnification. Therefore, it is very important to protect the environment, in the current urban environment, with a telescope, most of the time, 7 kilometers away is a white expanse, because there is too much dust and haze in the air, so that the light of the scenery can not travel very far.

====——I think, you want to understand the effect of this product, let's talk about the specifications first, purely in terms of specifications, for example, look at the scenery of 80 meters, it feels as if it is in 10 meters. As for the clarity, as mentioned above, it is not visible in this specification, and it is related to the quality of the product.

As you can see from the specifications, this is a telescope with 8 times and a front lens diameter of 40 mm;

Generally speaking, the larger the diameter of the front lens, the brighter and easier it is to see the object in the field of view.

The magnification of the hand-held telescope is generally 8-10 times, and fixed objects are required for observation higher than 10 times;

The brightness of the field of view is also related to the number of lenses and the type of coating they have.

Summary. Hello, about your question, I think that generally speaking, the targets of astronomical observations Deep-sky objects, star clusters, nebulae, galaxies are very faint, and the basic principle of choosing binoculars is to choose a higher brightness.

Generally speaking, the larger the aperture, the smaller the magnification, and the greater the brightness of the field of view of the binocular.

The smaller the multiple, the larger the actual field of view. It's easier for beginners to find stars. For example, during the Messier marathon.

To sum up: 8x42 should be chosen

Of course, there are some important indicators, such as whether the eyepiece is a wide-angle design, coating, waterproof, and so on.

The 10x42 and 8x42 telescopes see more clearly.

Hello, about your question, I think that generally speaking, the targets of astronomical observations deep-sky objects, star clusters, star occultation, imitation Zen clouds, galaxies are very faint, and the basic principle of choosing binoculars is to choose a brighter one. Generally speaking, the larger the aperture, the smaller the magnification, and the greater the brightness of the field of view of the binocular. The smaller the multiple, the larger the actual field of view.

For Chu Hongchen scholars, it is easier to find Xingdafan. For example, during the Messier marathon. In summary:

8x42 should be chosen, of course, there are some important indicators, such as whether the eyepiece is a wide-angle design, coating, waterproof, etc.

8 times and 10 times, in fact, it is difficult to simply say which is better or worse, even among telescope enthusiasts, it is also an "eternal topic", and many people insist on their own opinions. Some like the former, some like the latter. Personally, I feel that this thing is not an objective merit or inferiority, but to a large extent, like the preference for color, it is a personalized choice.

Under similar specifications, the field of view of 8 times is large, the hand is stable, and the sense of closeness of 10 times is stronger, but the field of view is smaller, and it is not as stable as 8 times. They all have their own merits and features. But for most occasions, the overall comparison, or 8 times more advantageous, if you don't have intuitive experience in this area, you can search for it:

Popular Optics 8x or 10x? , there is a gesture town simulation and instructions, which may seem more intuitive.

The parameter x60 indicates that the magnification of the telescope lens is 40 times, and the diameter of the objective lens is 60mm.

2. There are many things that are more important than multiples when choosing a telescope, such as the diameter of the exit pupil and the field of view. Multiples are not the only criterion. Because if the magnification exceeds the standard allowed by the telescope specifications, the clarity of the clear finger will decrease.

For example, for a telescope with an objective lens diameter of 50 mm, the magnification should not exceed 50 times. In fact, a telescope of about 10 times is enough for most of our requirements.

3. The distance seen through the telescope is related to people's eyesight.

4. The distance seen by the telescope is related to the size of the object.

5. The distance seen by the telescope is related to the air quality.

6. The distance seen by the telescope is related to the quality of the telescope itself.

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.

The telescope 12x50 means that the magnification is 12x and the objective lens diameter is 50mm.

Based on the magnification, the field of view of the telescope can be calculated, i.e., the size of the range that the telescope is able to see.

The field of view of the telescope is: 240 meters.

Therefore, the telescopic lead ruler mirror 12x50 can see 240 meters.

12 times the number of meters you can see, 12 times which means that it is originally 1200 meters away, and the state is 1/12 meters closer, which is equivalent to 100 meters through the telescope.