How to choose a telescope?

Master teaches you how to choose a telescope!

You can try to find it in commodity distribution centers such as science and technology markets, and you may find it.

Also, you can pay attention to the breeding grounds, optical shops and photographic equipment shops. Sometimes things like this happen. Ordinary shops may not be easy to find.

However, there are many fakes now. Fake and shoddy products account for more than 95% of the market, and there are all kinds of false propaganda, such as "night vision", "infrared", "Japanese cherry blossoms" and "Russia". I suggest you know the basics: ytwscc/...e E.

Pay special attention to issues such as multiple, military and night vision, that is, the introduction of some common false propaganda.

Basically, I have a familiar understanding of these aspects, and the effect of on-site comparison is generally no problem, that is, there are more inferior and counterfeit products, and caution is the most important.

In addition, hand-held generally do not choose zoom. At present, many hand-held telescopes on the market are zoom, and the specifications are similar to 10-30X60 15-40X70. At present, this kind of hand-held telescope can't be said to be 120%, but it can be said that 99.999% are fooled by the parameters of people who are not familiar with telescopes. Don't choose hand-held zoom. (High-powered desktop (tripod) binoculars are relatively high-grade, because the technology is good, you can choose this structure, which is more convenient, but don't choose hand-held binoculars. )

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Outdoor, I personally suggest that the multiple should not be too high. For hand-held telescopes, there is an optimal standard multiple range, that is, 7 ~ 10, and all military hand-held telescopes in service are in this range. Outdoor, I suggest you refer to the military option, which is generally more than 7 times and 8 times, and less than 10 times. You can choose 8 times. This is my opinion. The pandas on the market now are not produced in Guang Yun, but by some small manufacturers. Because Guang Yun has not produced civilian products for many years. Not good, just so-so, low-grade products.

How to choose a telescope? What kind of telescope is better for 50 minutes?

Hello! First of all, according to the price, choose the mirror with the best performance in this price, and the telescope that suits you is a good telescope.

How to choose a telescope

About magnification: each telescope is marked with main parameters, such as 7 * 35, which means 7 times the mirror surface and 35mm objective lens. Generally, below 6 times is low power, 6- 10 times is medium power, and above 10 times is high power. Many people always think that the higher the multiple, the better. Some manufacturers also use false high magnification to attract consumers. In fact, the reasonable magnification of the telescope is related to the aperture and observation mode of the telescope: the larger the aperture, the higher the magnification, and the fixed observation with tripod can be higher than the handheld observation. If you buy hand-held binoculars, 7- 10 times is enough, and at most it is not more than 12 times. Otherwise, the higher the magnification, the smaller and darker the observation field of view will be, and the observation effect will be reduced, especially the jitter caused by high magnification will be greatly increased, making the observed scenery unstable and difficult to observe normally. Although there are many kinds of telescopes in the world, including American and Russian, most of them are 6- 10 times. Some world-famous brands such as Zeiss and Nikon also produce telescopes with medium magnification, because clear and stable imaging is the most important.

About aperture: The larger the aperture, the greater the observation field of vision and brightness, which is conducive to observation in dim light. But the larger the aperture, the greater the volume and weight, and the higher the cost. Generally, it can be selected between 30 and 30-50 mm as required.

About the field of view: the field of view refers to the field of view that can be observed at a kilometer, such as 1000/93m, which means that the telescope can observe a range of 93m wide at a kilometer, or it can be converted into "degrees" and expressed as 5 30'. The comparison of the size of the field of view must be carried out under the condition of similar caliber and the same multiple. The key to the size of the field of view lies in the design of the eyepiece part of the prism system. General famous factories and advanced varieties of military telescopes all adopt wide-angle and large-field design, which will give people a feeling of being broad, comfortable and relaxed.

About coating: The purpose of mirror coating is to reduce reflection, increase light transmittance and improve observation brightness. Different coating colors have nothing to do with quality. The thinner the coating, the smaller the reflection, the better. However, in recent years, various red and yellow film telescopes with strong reflectivity have appeared in various markets, which are very attractive to consumers. In fact, this inferior coating reflection has lost a lot of light, making the color colder and darker, and the clarity is reduced. What's more, some people even call this inferior red film telescope "night vision" and "infrared night vision telescope" to deceive consumers, which is actually true.

Structural materials: In order to reduce the cost, most ordinary telescopes on the market use plastic lens barrels, and only a few advanced products and military models use all-metal structures, which are expensive, but their durability is unparalleled. Although the appearance of several Soviet-made all-metal military telescopes collected by the author decades ago is very old, the operation of each part is still flexible and the optical performance is excellent.

The military ranging telescope is equipped with dense bit lines in the right eyepiece for ranging, and the distance between targets can be roughly determined by calculation. However, for sightseeing, the secret passage line is a bit remote. Moreover, the ranging telescope is a bit troublesome because the left and right eyepieces are focused separately. Unless it is particularly necessary, it is not necessary to choose a ranging telescope.

Some so-called "autofocus telescopes" actually fix the focus at tens of meters away and use the limited depth of field to achieve certain clarity, thus canceling the focusing mechanism and reducing the cost. At present, I haven't seen the real autofocus telescope.

What the telescope can see: This is mainly related to the performance of the telescope, weather conditions and target size. According to the author's test, with Russian-made 8 * 40 civil binoculars, you can see the bugs on the telephone poles from 100 meters away, and you can see the faces of outsiders and vehicles driving dozens of kilometers away from hundreds of meters away. At night, you can also see many craters on the moon, four moons of Jupiter, cluster nebulae and so on. In fact, friends who are interested in astronomy can try it.

Some advertisements say that the telescope can see targets dozens of kilometers away and one meter away. In fact, it is theoretically impossible to observe a target one meter away from 50 kilometers horizontally on the ground, because the atmosphere near the ground is dense and dusty, and more importantly, the earth is round.

Shopping: Generally speaking, the world-famous binoculars are amazing in optical performance, appearance, feel and packaging, and of course the price is high. A famous 7 * 50 binoculars 1200 yuan. country ......

How to choose a monocular telescope?

About magnification: each telescope is marked with main parameters, such as 7 * 35, which means 7 times the mirror surface and 35mm objective lens. Generally, below 6 times is low power, 6- 10 times is medium power, and above 10 times is high power. Many people always think that the higher the multiple, the better. Some manufacturers also use false high magnification to attract consumers. In fact, the reasonable magnification of the telescope is related to the aperture and observation mode of the telescope: the larger the aperture, the higher the magnification, and the fixed observation with tripod can be higher than the handheld observation. If you buy hand-held binoculars, 7- 10 times is enough, and at most it is not more than 12 times. Otherwise, the higher the magnification, the smaller and darker the observation field of view will be, and the observation effect will be reduced, especially the jitter caused by high magnification will be greatly increased, making the observed scenery unstable and difficult to observe normally. Although there are many kinds of telescopes in the world, including American and Russian, most of them are 6- 10 times. Some world-famous brands such as Zeiss and Nikon also produce telescopes with medium magnification, because clear and stable imaging is the most important.

About aperture: The larger the aperture, the greater the observation field of vision and brightness, which is conducive to observation in dim light. But the larger the aperture, the greater the volume and weight, and the higher the cost. Generally, it can be selected between 30 and 30-50 mm as required.

About the field of view: the field of view refers to the field of view that can be observed at a kilometer, such as 1000/93m, which means that the telescope can observe a range of 93m wide at a kilometer, or it can be converted into "degrees" and expressed as 5 30'. The comparison of the size of the field of view must be carried out under the condition of similar caliber and the same multiple. The key to the size of the field of view lies in the design of the eyepiece part of the prism system. General famous factories and advanced varieties of military telescopes all adopt wide-angle and large-field design, which will give people a feeling of being broad, comfortable and relaxed.

About coating: the function of lens coating is to reduce reflection, increase light transmittance and improve observation brightness. Different coating colors have nothing to do with quality. The thinner the coating, the smaller the reflection, the better. However, in recent years, various red and yellow film telescopes with strong reflectivity have appeared in various markets, which are very attractive to consumers. In fact, this inferior coating reflection has lost a lot of light, making the color colder and darker, and the clarity is reduced. What's more, some people even call this inferior red film telescope "night vision" and "infrared night vision telescope" to deceive consumers, which is actually true.

Structural materials: In order to reduce the cost, most ordinary telescopes on the market use plastic lens barrels, and only a few advanced products and military models use all-metal structures, which are expensive, but their durability is unparalleled. Although the appearance of several Soviet-made all-metal military telescopes collected by the author decades ago is very old, the operation of each part is still flexible and the optical performance is excellent.

I want to buy a telescope, but I don't know how to choose ~ ~

Tell the truth, don't buy either.

Undoubtedly, both of them are virtual labels, and the correct label of binoculars should be (magnification) x (objective aperture), while hand-held binoculars will be unusable because of the influence of hand shaking as long as they exceed 12 times. Just as I can't hold peanuts with chopsticks two meters long, it doesn't mean I can see them without shaking hands.

Virtual standard, you can know that the quality will be very poor. Because manufacturers mislabel simple data, will they do it with care in optics?

Inferior binoculars are likely to have inaccurate optical axes, and the direct consequence is dizziness and vomiting. The imaging effect will not be good.

If you really want to buy something good, I suggest diving in the forum. You should know it for a while before you decide. Don't be deceived by bad things or people.

How to choose a telescope

Seeing that the parameters listed in your list should be binoculars, simply explain the meaning of these parameters: 1. Objective lens: 25mm, which is the aperture of the objective lens. You can directly understand the diameter of the objective lens (that is, the large lens at the far end of the telescope), which is the most important parameter of the telescope. 25mm telescope is portable, which has the advantage of being small and easy to carry, but the effect is average. If you want better effect, you should choose 50 mm. Eyepiece: 12mm, this should be the eyepiece aperture, which is of little significance; 3. Exit pupil distance: 6mm. Simply put, the pupillary distance is the distance between your eyes and the eyepiece when you are observing. The exit pupil distance is between 10 mm and15 mm. If it is less than 8 mm, anyone will feel uncomfortable. Obviously, your 6mm is too small, so you need to keep your eyes close to the telescope when observing, which will be very uncomfortable. 4. The exit pupil diameter: 2.7 mm, the larger the exit pupil diameter, the greater the imaging brightness. The pupil diameter of our eyes varies from 2mm to 7mm, depending on the darkness of light. Therefore, it is significant that the diameter of the exit pupil is within 2mm to 7mm. Your exit pupil is 2.7mm in diameter, which should be dark and suitable for daytime use. The exit pupil diameter is calculated by dividing the objective aperture by the magnification. 5. Coating is to reduce the chromatic aberration of the telescope. Nowadays, telescopes are generally coated. 6. Visual object: 96m/ 1000m, which should be the visual field, that is, the size of the visual field. The range you listed represents 1000m, and the visible range is 96m. 7.Zoom, as you said, can zoom in and out. However, it is not recommended to buy a zoom telescope, because the advantage of zooming is practical and convenient, but at the cost of reducing the optical effect, the zoom system is easy to be out of step and damaged, and the high-power field of view is small. Moreover, due to the addition of a zoom lens, optics is not easy to process. Therefore, some zoom lenses are prone to optical axis problems or zoom synchronization problems after long-term use. Its optical performance is also worse than that of similar fixed-focus lenses. First of all, if you have questions, let's continue to communicate.

Selection of telescope

Generally speaking, the optical performance, appearance, feel and packaging of world-famous binoculars are amazing, and of course the price is high. A famous 7 * 50 binoculars 1200 yuan. It is the wish of every travel enthusiast to have a telescope with excellent performance. At present, there are many kinds of telescopes on the market with uneven quality, and there are few articles about telescope knowledge, which makes many people at a loss. Telescope magnification: each telescope is marked with main parameters, such as 7 * 35, which means that the telescope is 7 times, and the aperture of the telescope objective is 35mm. Generally, below 6 times is low power, 6- 10 times is medium power, and above 10 times is high power. Many people always think that the higher the magnification of a telescope, the better. Some telescope manufacturers also attract consumers with false magnifications. In fact, the reasonable magnification of the telescope is related to the aperture and observation mode of the telescope: if the aperture of the telescope is large, the magnification can be appropriately higher, and the fixed observation with a tripod can be higher than the handheld observation. If you buy hand-held binoculars, 7- 10 times is enough, and at most it is not more than 12 times. Otherwise, the higher the telescope magnification, the smaller and darker the observation field of view, and the lower the observation effect, especially the jitter caused by high magnification will greatly increase, making the observed scenery unstable and difficult to observe normally. Although there are many kinds of telescopes in the world, including American and Russian, most of them are 6- 10 times. Some world-famous brands such as Zeiss and Nikon also produce telescopes with medium magnification, because clear and stable imaging is the most important. About the diameter of the telescope: the larger the diameter of the telescope, the greater the brightness of observation, which is conducive to observation in dim light. However, the larger the diameter of the telescope, the larger the volume and weight, and the higher the cost. Generally, you can choose between 30-50 mm telescopes according to your needs. About the field of view of the telescope: the field of view refers to the field of view that can be observed at a kilometer, such as 1000/93m, which means that the telescope can observe a range of 93m wide at a kilometer, or it can be converted into "degrees" and expressed as 5 30'. The comparison of telescope field of view must be carried out under the conditions of similar aperture and the same multiple. The key of field of view lies in the design of eyepiece of prism system. General famous factories and advanced varieties of military telescopes all adopt wide-angle and large-field design, which will give people a feeling of being broad, comfortable and relaxed. About telescope coating: the function of telescope lens coating is to reduce reflection, increase the transmittance of telescope and improve the observation brightness. Different colors of telescope coatings have nothing to do with quality. The lighter the coating, the smaller the reflection, the better. However, in recent years, various red and yellow film telescopes with strong reflectivity have appeared in various markets, which are very attractive to consumers. In fact, this inferior coating reflection has lost a lot of light, making the color colder and darker, and the clarity is reduced. What's more, some people even call this inferior red film telescope "low-light night vision" and "infrared night vision telescope" to deceive consumers. In fact, telescope structural materials: In order to reduce the cost, most ordinary telescopes on the market use plastic lens barrels, and only a few advanced products and military models use all-metal structures, which are expensive, but their durability is unparalleled. Although the appearance of several Soviet-made all-metal military telescopes collected by the author decades ago is very old, the operation of each part is still flexible and the optical performance is excellent. The military ranging telescope is equipped with dense bit lines in the right eyepiece for ranging, and the distance between targets can be roughly determined by calculation. However, for sightseeing, the secret passage line is a bit remote. Moreover, the ranging telescope is a bit troublesome because the left and right eyepieces are focused separately. Unless it is particularly necessary, there is no need to buy a ranging telescope. Some so-called "autofocus telescopes" actually fix the focus at tens of meters away and use the limited depth of field to achieve certain clarity, thus canceling the focusing mechanism and reducing the cost. I haven't seen a real autofocus telescope yet. What the telescope can see: This is mainly related to the performance of the telescope, weather conditions and target size. According to the author's test, with the Russian-made 8 * 40 civil binoculars, you can clearly see the bugs on the telephone pole at 100 meters, the faces of people hundreds of meters away and the vehicles driving for dozens of kilometers, and you can also see the dense craters and Jupiter on the moon at night. ......

I want to buy binoculars. How should I choose?

In fact, in recent years, many telescope lovers have lost confidence in domestic telescopes, because many informal small manufacturers have produced a large number of counterfeit and shoddy products. In fact, China has made great achievements in telescope optics, but the regular products are difficult to buy in the market because of their small output and high price. Many regular products have been wholesale by shopping malls in major cities, and the price is very high, generally 2-3 times or more of the market price! However, in Jinzhou, Shenyang and other areas of Liaoning, I have also seen some famous brands, such as: Debao (TASCO, BRESSER), Panda, TASCO (USA), BOSMA (Guanbo), NIKULA, and some brands of regular manufacturers in the south. In fact, the performance of these regular products in China is also good, and the overall performance is not inferior to similar products abroad. In Jinzhou area, Debao and TASCO (American/German brand, made in China) series are the most common. However, most of them are in big shopping malls (department stores, Zhong Bai, Hualian Supermarket), and their prices are very high. Of course, telescopes are also sold in shopping malls, electronic markets, single holes and antique markets in CUHK, and the prices of similar products are lower than those of department stores and Hualian. Influenced by the West, China also introduced zoom binoculars. This telescope has a wide zoom range and many uses, and the magnification can be adjusted at will according to different observation targets (including environmental brightness, observation distance and other conditions). However, its optical performance is not as good as that of a single telescope, and its field of view is relatively small, resulting in serious chromatic aberration. At low magnification, good performance. The higher the magnification, the lower the brightness and the worse the definition. At the same time, the deviation of the optical axis will also make the observer feel uncomfortable. Even domestic regular products or imported famous brands have the above problems to some extent. Its price is also relatively high. The market price of an ordinary 50MM diameter binocular zoom model is 300-400 yuan, while the price of domestic regular products and imported famous brands is higher. I don't advocate that you buy a zoom telescope. If you must buy it, buy domestic (imported) brand-name products. Only in this way can the quality be guaranteed. Generally speaking, it is enough to choose 7-20 times (standard multiple) zoom binoculars. As for multiples as high as 30 times or more, it is impossible to talk about it. Even if you have such economic strength, it is also a waste. If a friend is interested in astronomical observation, he might as well buy a domestic boutique telescope and fix it on a tripod for observation. Speaking of some excellent telescopes in China, they are all-metal large-caliber nitrogen-filled waterproof telescopes, medium-caliber nitrogen-filled waterproof telescopes and some new nonmetallic economical telescopes introduced in recent years. These products have excellent performance and are expensive. The specific model and performance are shown in the following table: type, model and price (estimated). Large-caliber boutique double-barrel 20×80 980-3000 yuan all-metal structure, wide-angle and large field of view, BaK4 prism, MC/GMC coating, excellent performance. Nitrogen sealing, waterproof, dustproof and anti-collision. Can be connected to a tripod, suitable for astronomical and ground observation. It is heavy and bulky, so it is not suitable for hand-held observation. Looking at the specific performance, the price gap is also very large. 22× 100 1500-3000 RMB 25× 100 1700-3000 RMB 30× 100 RMB 2000-3000 RMB 65/80/85. Can be connected to a tripod, suitable for astronomical and ground observation. There are straight and folded tubes to choose from. Medium-caliber double-tube 8×40 350 yuan main metal, high-density nitrogen seal, waterproof, dustproof and collision-proof, wide-angle and large field of view, high-quality optical lens, low price and comfortable feel. 10×50 380 yuan 12×50 400 yuan medium caliber boutique double barrel (LOAVA) 8×45 600 yuan all-metal structure, wide angle and large field of view, BaK4 prism, MC/GMC coating, excellent performance. Nitrogen sealing, waterproof, dustproof and collision-proof. 7×50 630 yuan 10×50 660 yuan 12×50 700 yuan economical twin cylinders15× 60/7016× 60/80 20× 60/80 350-700 yuan. ......

I want to buy a telescope, but I don't know how to choose. How to compare the quality of telescopes? What are the commonly used parameters?

The magnification of the telescope is selected as that of the hand-held binoculars, which is basically between 7 ~ 10. It's not that it's difficult to make a telescope with higher magnification, but it's because long-term practice has found that the magnification of 7 ~ 10 is the most suitable magnification range for hand-held telescopes. Military hand-held telescopes strictly follow this standard. For example, hand-held telescopes in active service are not more than 10 times, and the most commonly used ones are 7 times and 8 times. For example, the most commonly used hand-held telescope of the US military in Iraq is seven times. And China is a classic old military mirror, which is eight times. In the optical industry, 7, 8 and 10 are the best standard multiples of hand-held telescopes (the multiples of ordinary toy telescopes are generally 2-3 times, and the multiples of ancient binoculars are 3-5 times). Desktop Telescope According to different requirements, optical instrument manufacturers have also designed and produced various types of telescopes. Some people need to take them with them to travel, which is the hand-held telescope mentioned above. Sometimes you don't need to carry it with you, you don't need a big field of vision, but you need a higher magnification, that is, a high-powered desktop telescope. In order to reduce the shaking caused by too high magnification, the desktop telescope needs tripod for auxiliary fixation. Therefore, it is not suitable for traveling and traveling-this requires consumers to choose the corresponding products according to their own needs. Astronomical telescope Many people want "astronomical telescope" and think that astronomical telescope is "multiple". In fact, there are deep misunderstandings, many of which are misled by some film and television works. The police investigating the case used astronomical telescopes to monitor the criminal's movements. This can't be done in the real scene, because the astronomical telescope is specially used to watch the stars, and the picture doesn't matter whether it is positive or negative, so there is no prism in it, and all the images are inverted. Even with a positive mirror (also called a zenith mirror), the imaging is left and right. In addition, the current market for low-end astronomical telescopes is chaotic, and the fish is mixed. We recommend that you buy astronomical telescopes with credible brands. Astronomical telescope is specially designed for observing the sky, and many important indexes are ignored in the design of astronomical telescope. The viewing effect of astronomical telescopes of the same level is far less than that of ordinary desktop telescopes (such as field of view, edge definition, color reproduction, etc.). ) For non-astronomy enthusiasts, the desktop telescope is more widely used than astronomy and has better comprehensive effect. Telescope industry The domestic telescope market is chaotic, and there are many inferior counterfeit products on the market. Several truly powerful large-scale (military) foreign trade optical manufacturers, without paying attention to the domestic market, have long focused on military production and export foreign trade. Therefore, although some famous products in the world are actually closely related to China, the domestic market is mainly relatively inferior fake and shoddy products produced by some small private manufacturers and even individual workshops. Ordinary people look at telescopes. In fact, there are many internal differences, such as the grade of optical glass, the quality of lenses made of optical glass, especially composite lenses, and the grade of internal prisms with different grinding accuracy. It can be said that a telescope with similar appearance can be different from the world in internal quality and cost. A high-quality product, only the optical glass material used internally, is higher than the total cost of a low-quality product. This is also the reason why it is difficult for large-scale optical enterprises that strictly follow the industry norms to gain a foothold in the chaotic domestic market competition and turn to a mature, standardized and truly powerful foreign trade market. The products provided here are all from this large (military) foreign trade manufacturer. Reasonable selection of telescope multiples is not the only problem to consider when choosing a telescope. At the same time, there are other problems, such as whether the vision is broad and whether the hands are stable. Why are military telescopes basically 7 times, 8 times or 10 times, but not 12 times or even higher? It is because it exceeds the reasonable multiple, the field of vision is narrow, and high multiple brings instability. There is nothing wrong with this at home. Once you take it out for an outing and observe it with a high-powered telescope, you need to work hard to remain stable (you can't tremble), and with a narrow field of vision, you will feel more tired and embarrassed. Generally, about 8 times of products do not have this problem, which is more suitable for tourism. According to your functional needs, such as travel, concert, outdoor, etc. Choose the telescope you need, size, demonstration clarity, etc. If you have more questions, please feel free to contact 38-degree customer service for consultation. I found it online. I'll send you links to more telescopes. You can see for yourself. ......