Question 1: How about the TASCO Debao telescope? I would like to remind you that TASCO and BUSHNELL are the so-called "Russian telescopes", "Japanese Sakura telescopes" and "infrared night vision telescopes" in China. There are two favorite brands for counterfeit and inferior products.
If it is in the 3 or 400 price range, be more cautious. It doesn't matter if it's expensive, the fake ones are generally not very expensive.
Regarding identification, etc., you can read Popular Optics, which has some basic knowledge introduction and is relatively comprehensive.
Question 2: Is Debao telescope better or Japan’s Kenco? Hello, I am a distributor of a military optical manufacturer. We do OEM for these two brands. Obviously Japan’s Kenco is better. Much better.
Tasco has collapsed a long time ago. Now it is acquired by BUSHNELL and the brand is retained. The product is average.
In addition, can you elaborate on the specifications you chose? ――Why do you think the specifications are not very standard specifications? The specifications are also very important.
Regarding Debao, many of them are fake now, so be careful. Not only Debao, in fact, there are many inferior products in the domestic market now. Fake and inferior products account for more than 95% of the market. The trouble is that there are also false propaganda, such as "night vision", "infrared", "Japanese cherry blossoms", "Russian" and so on. Wait, so I suggest you understand the basic knowledge. You can't just look at the brand. It can be made with inferior quality. It's not easy to print a fake brand: you can look at ytwscc and click on "Telescope Knowledge and Introduction" - there is a "Common Sense and Identification" ”
Pay special attention to issues related to multiples, military use, night vision, etc., which is also an introduction to some common false propaganda. Otherwise, people who don’t understand can easily be deceived in such market conditions.
Question 3: Which brand of telescope is better? What is the telescope brand? European series: German Zeiss, German Leica, Austrian Swarovski, Stadel. This is recognized as one of the "three major brands" of telescopes in the world and a "luxury product" among telescopes. The cheapest telescopes of this type of brand are generally above 3K, and slightly better ones cost tens of thousands of yuan. All telescopes from these brands are top quality. There is no doubt that almost all players. For this reason, there are many brands that always compare their own brands with theirs, ranking them together everywhere. They are not common in domestic sales points. As far as Guangzhou is concerned, they are rarely seen in Guangbai shopping malls with a dazzling array of luxury goods. Domestic customer groups are generally telescope enthusiasts, agricultural, forestry and mineral research institutions, school bird watching clubs, senior bird watchers, etc. Due to the high price, the purchase method in China is generally a prepayment order.
Japanese brand. In addition to recognized world-renowned brands, Japanese brands are also a good choice.
Japanese brands also have very high-end, luxury, and top-level mirrors. They even have their own uniqueness in a certain aspect and surpass the "three major brands"; their product line is also relatively complete. There are all high, medium and low-end goods. Such brands include: Nikon telescopes, Olympus telescopes, Canon, KOWA, and MINOX. These brands have certain price advantages and very good optical quality, so we often see them in some domestic industries.
The American telescope brand is represented by Bushnell, and its annual sales volume and production capacity are quite huge. Occupy a huge market share. Product features: moderate price, excellent optical quality.
Finally, there is the domestic series of telescopes. Judging from the current domestic sales situation, the domestic telescopes are none other than Boguan, Liko and other products.
Boguan’s product series is very comprehensive, with various prices and specifications. The domestic market coverage is quite huge, which is inseparable from Boguan's consistently excellent brand operation, perfect after-sales service, and strong distribution network. Boguan Company has made rapid progress in recent years, and Boguan has repeatedly appeared in major domestic events and bird watching activities.
NIKULA is a factory-type enterprise with a variety of sophisticated molds. It has always focused on exporting and OEM for well-known foreign brands. Its own brand NIKULA has also attracted a large number of loyal users due to its high cost performance. In particular, the ED mirror Wuji's high-quality products, the sniper's 24-72*100A, are highly sought after by enthusiasts.
Effective aperture and relative aperture
The distance from the center of the objective lens to the focus is called the focal length of the objective lens, represented by the symbol F. The part of the diameter of the objective lens that is not blocked by the frame and aperture is called the effective diameter of the objective lens, represented by the symbol D. The performance of astronomical telescopes is mainly marked by these two data. The ratio of effective aperture to focal length is called relative aperture, represented by the symbol A. That is: A=D/F, where D and F are measured in millimeters.
Magnification
The ratio of the focal length of the telescope's objective lens (F) to the focal length of the eyepiece (f) is called the magnification of the telescope, represented by the symbol M. An astronomical telescope is usually equipped with several eyepieces of different focal lengths, allowing several different magnifications to be obtained. For example, when the focal length of the telescope's objective lens is 840 mm and the focal length of the eyepiece is 10 mm, the magnification is 84 times. If the focal length of the other eyepiece is 20 mm, the magnification of the telescope is 42 times.
Light gathering power
Light enters the human eye through the pupil, and the human eye can only collect light equivalent to the area of ??the pupil. In dark places, the pupil diameter of the human eye is generally about 7mm. Therefore, the multiple of the effective area of ??the telescope objective lens relative to the pupil area is called the light-gathering power. That is: light-gathering power = (D*D)/(7*7), where D is measured in millimeters.
Resolution
Due to the diffraction of light, the image of a celestial body in a telescope will become a small disk. If two stars are so close that they can just be distinguished, their minimum angular distance is called the resolution, represented by the symbol θ, and the unit is arc seconds. The relationship between the telescope resolution and the effective diameter of the objective lens can be roughly expressed as: θ=140/D, where D is measured in millimeters. For astronomical observations, resolution is often more important than magnification.
Field of view
The angular diameter of the area of ??sky that can be seen in a telescope is called the field of view. Represented by the symbol ω. For a telescope, the field of view is related to the focal length of the eyepiece. The shorter the focal length of the eyepiece, the smaller the field of view of the telescope. In other words, the greater the magnification of a telescope, the smaller the field of view.
You can take a look at these: 1. BUSHNELL (Ph.D.) 2. NIKON (Nikon) 3. TASCO (Debao) 4. Y......>>
Question 4: What kind of telescope is best to buy? Hello, I am a distributor of a military optical manufacturer. Our factory produces night vision rifle scopes for the army.
If you are interested in the so-called "night vision binoculars" that often appear on the Internet, please be reminded that this is a common false propaganda for inferior products on the market.
I don’t know if you know that the so-called “see far” and “night vision telescopes” are common deceptive propaganda of inferior products. ――There is no such thing.
If you follow this "guiding idea", it will probably be easy. .
You can pay more attention to local gyms.
Also, pay attention to optical stores and photographic equipment stores. Sometimes there are such things. Ordinary stores may not be easy to find.
However, there are quite a lot of counterfeit products nowadays. Fake and inferior products account for more than 95% of the market. The trouble is that there are also false propaganda, such as "night vision", "infrared", "Japanese cherry blossoms", "Russian", etc. Wait, etc., so it is recommended that you understand the basic knowledge: you can take a look at one.ytwscc/...e basic identification aspects
Pay special attention to the issues related to multiples, military use, night vision, etc., that is, An introduction to some common false propaganda.
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What really enables night vision is night vision equipment, which requires electricity and relies on some electronics. The amplification and excitation of components are used to image and enhance the weak light at night in nature.
The cheapest one may cost more than 1,000 yuan, but the results below 2,000 yuan are very poor.
Night vision goggles and telescopes are completely different. Night vision goggles have almost no amplification, only 2 to 3 times, and cannot be used during the day. Moreover, the clarity is definitely far behind that of telescopes, because they rely on screens to produce images.
Question 5: Which brand of general telescope is better? 10 points European series: German Zeiss, German Leica, Austrian Swarovski, Stadel. This is recognized as one of the "three major brands" of telescopes in the world and a "luxury product" among telescopes. The cheapest telescopes of this type of brand are generally above 3K, and slightly better ones cost tens of thousands of yuan. All telescopes from these brands are top quality. There is no doubt that almost all players. For this reason, there are many brands that always compare their own brands with theirs, ranking them together everywhere. They are not common at domestic sales points. As far as Guangzhou is concerned, they are rarely seen in Guangbai shopping malls with a dazzling array of luxury goods. Domestic customer groups are generally telescope enthusiasts, agricultural, forestry and mineral research institutions, school bird watching clubs, senior bird watchers, etc. Due to the high price, the purchase method in China is generally a prepayment order.
Japanese brand. In addition to recognized world-renowned brands, Japanese brands are also a good choice.
Japanese brands also have very high-end, luxury, and top-level mirrors. They even have their own uniqueness in a certain aspect and surpass the "three major brands"; their product line is also relatively complete. There are all high, medium and low-end goods. Such brands include: Nikon telescopes, Olympus telescopes, Canon, KOWA, and MINOX. These brands have certain price advantages and very good optical quality, so we often see them in some domestic industries.
The American telescope brand is represented by Bushnell, and its annual sales volume and production capacity are quite huge. Occupy a huge market share. Product features: moderate price, excellent optical quality.
Finally, there is the domestic series of telescopes. Judging from the current domestic sales situation, the domestic telescopes are none other than Boguan, Liko and other products.
Boguan's product series is very comprehensive, with various prices and specifications. The domestic market coverage is quite huge, which is inseparable from Boguan's consistently excellent brand operation, perfect after-sales service, and strong distribution network. Boguan Company has made rapid progress in recent years, and Boguan has repeatedly appeared in major domestic events and bird watching activities.
NIKULA is a factory-type enterprise with a variety of sophisticated molds. It has always focused on exporting and OEM for well-known foreign brands. Its own brand NIKULA has also attracted a large number of loyal users due to its high cost performance. In particular, the ED mirror Wuji's high-quality products, the sniper's 24-72*100A, are highly sought after by enthusiasts.
Effective aperture and relative aperture
The distance from the center of the objective lens to the focus is called the focal length of the objective lens, represented by the symbol F. The part of the diameter of the objective lens that is not blocked by the frame and aperture is called the effective diameter of the objective lens, represented by the symbol D. The performance of astronomical telescopes is mainly marked by these two data. The ratio of effective aperture to focal length is called relative aperture, represented by the symbol A. That is: A=D/F, where D and F are measured in millimeters.
Magnification
The ratio of the focal length of the telescope's objective lens (F) to the focal length of the eyepiece (f) is called the magnification of the telescope, represented by the symbol M. An astronomical telescope is usually equipped with several eyepieces of different focal lengths, allowing several different magnifications to be obtained. For example, when the focal length of the telescope's objective lens is 840 mm and the focal length of the eyepiece is 10 mm, the magnification is 84 times. If the focal length of the other eyepiece is 20 mm, the magnification of the telescope is 42 times.
Light gathering power
Light enters the human eye through the pupil, and the human eye can only collect light equivalent to the area of ??the pupil. In dark places, the pupil diameter of the human eye is generally about 7mm. Therefore, the multiple of the effective area of ??the telescope objective lens relative to the pupil area is called the light-gathering power. That is: light gathering power = (D*D)/(7*7), where D is measured in millimeters.
Resolution
Due to the diffraction of light, the image of a celestial body in a telescope will become a small disk. If two stars are so close that they can just be distinguished, their minimum angular distance is called the resolution, represented by the symbol θ, and the unit is arc seconds.
The relationship between the telescope resolution and the effective diameter of the objective lens can be roughly expressed as: θ=140/D, where D is measured in millimeters. For astronomical observations, resolution is often more important than magnification.
Field of view
The angular diameter of the area of ??sky that can be seen in a telescope is called the field of view. Represented by the symbol ω. For a telescope, the field of view is related to the focal length of the eyepiece. The shorter the focal length of the eyepiece, the smaller the field of view of the telescope. In other words, the greater the magnification of a telescope, the smaller the field of view.
You can take a look at these: 1. BUSHNELL (Ph.D.) 2. NIKON (Nikon) 3. TASCO (Debao) 4. Y...>>
Question 6: I want to buy a good telescope. I have never bought one. It is also very cheap on Taobao. To determine whether a telescope is good or bad, you must first look at it. The optical properties, and secondly, whether its mechanical properties (pointing accuracy and tracking accuracy) are excellent. Optical performance is generally measured by the following indicators.
1. Effective aperture: refers to the light diameter of the objective lens, that is, the entrance pupil diameter of the telescope (indicated by D). The larger the effective aperture of a telescope, the stronger its light-gathering ability and the ability to observe fainter celestial objects. It reflects the telescope's observation capabilities.
2. Focal length: The focal length of the telescope mainly refers to the focal length of the objective lens, represented by F. The focal length of the objective lens is the main indicator of film scale in astrophotography. For the same celestial body, the longer the focal length, the larger the image of the celestial body on the focal plane.
3. Relative aperture: also called optical power, it is the ratio of the effective aperture of the telescope to its focal length, also called the focal ratio, often expressed by A, A=D/F. Observations are more favorable with larger effective apertures because their imaging illumination is proportional to the square of the telescope's aperture. The relative aperture of refracting telescopes is relatively small, generally between 1/6 and 1/15 (medium focus). The relative aperture of reflecting telescopes is relatively large, generally between 1/3.5 and 1/5. When observing celestial objects, attention should be paid to selecting the appropriate effective aperture and focal ratio.
4. Magnification: refers to the angular magnification, which is the ratio of the focal length of the objective lens (F) to the focal length of the eyepiece (F’). It is also equal to the ratio of the entrance pupil to the exit pupil. Therefore, as long as you change different eyepieces, you can change the magnification. However, due to factors such as the resolution of the objective lens, atmospheric visual quietness, and the diameter of the exit pupil that cannot be too small, the magnification of the telescope cannot be increased indefinitely. Generally, it is appropriate to control it at 1-2 times the diameter of the objective lens in millimeters. (The maximum value should not exceed 300 times).
5. Resolution: The resolution of a telescope is measured by the reciprocal of the resolving angle of the telescope. The resolution angle is the minimum angular distance that the telescope can resolve, represented by δ. It is the angular distance between two luminous points on the celestial sphere that can just be resolved by a telescope.
6. Field of view: The angular diameter of the starry sky corresponding to the area that can be well imaged by the telescope, represented by ω. Inversely proportional to the magnification of the telescope. Different focal lengths, different optical systems and qualities (aberrations) determine the size of the telescope's field of view. Generally, the field of view of popular science reflecting telescopes is less than 1 degree.
7. Visibility: Refers to the faintest magnitude of stars that can be seen with a telescope in the zenith direction on a clear, moonless night, and the stars that can be observed with the naked eye under better conditions. The rating is six stars. The visual ability of a telescope is mainly related to the effective aperture of the telescope, the relative aperture, the absorption coefficient of the objective lens, the atmospheric absorption system and the sky background brightness. Popular astronomical telescopes can generally see stars of magnitude 10-12.
Configuration refers to the accessories of a telescope other than the main mirror body and angle bracket. It generally includes: eyepieces, finderscopes, extenders, erecting mirrors and other major accessories, which basically meet the needs of use. The "Debao" telescope is also equipped with additional accessories such as filters, camera interfaces, and moving star charts to meet the needs of users to a greater extent without the need to purchase related accessories again.
1. Eyepieces; A good astronomical telescope is generally equipped with multiple eyepieces. To meet different observation needs, in order to maximize the value of the telescope. When people investigate and understand telescopes, they often only pay attention to the objective lens of the telescope and ignore the eyepiece as the terminal of the telescope. As a result, they cannot fully play the role of the telescope and can only look at the sky and sigh.
The eyepiece has two main functions: one is to continue to magnify the image formed by the objective lens; the other is to turn the outgoing beam into parallel light to make observation more comfortable and convenient. There are many types of eyepieces, and there are three commonly used ones: Huygens (H), this type of eyepiece is suitable for low and medium magnification observation; Ramsden (R), this type of eyepiece is also suitable for low and medium magnification observation. ; Kenard (K) is an improved version of Ramsden, which eliminates Ramsden's chromatic aberration. This eyepiece has a large field of view and is often used for low-magnification observations, such as comets or large-area celestial bodies. There are also Steinheier's monocentric eyepieces, Chase's distortion-free eyepieces, Abbe's distortion-free eyepieces, Schick's distortion-free eyepieces, etc.
2. Finderscope: In order to quickly find the target to be observed during observation, a finderscope is usually attached next to the main mirror to help you aim at the target. Its optical axis is parallel to the primary mirror, so that it can maintain the same target as the primary mirror. Starfinders generally have a small magnification, a large field of view, and a reticle at the focal plane to calibrate the target. When observing, first use the finderscope to find the target to be observed and adjust it to the center of the field of view. The target to be observed will naturally be within the field of view of the primary mirror.
3. Extender: The extender is used to extend the focal length of the objective lens and increase the magnification of the telescope. 1...>>
Question 7: I want to buy a telescope, how do I choose? In fact, in recent years, due to the large number of fake and shoddy products produced by many irregular small manufacturers, many telescope enthusiasts have lost confidence in domestic telescopes. In fact, our country has made great achievements in telescope optics. However, due to the small output of regular products, the price is not low and it is difficult to buy them on the market. Many regular products have been wholesaled by shopping malls in major cities, and the prices are very high, usually 2-3 times or more than the market price! However, in Jinzhou, Shenyang and other areas of Liaoning, I have also seen some well-known brands, such as Debao (TASCO, BRESSER), Panda, TASCO (USA), BOSMA (Boguan), NIKULA, etc., as well as some regular manufacturers in the south. Products of other brands. In fact, the performance of these regular domestic products is also good, and their overall performance is not inferior to similar foreign products. In Jinzhou area, Debao and TASCO (American/German brand, produced in China) series are the most common. However, they are mostly found in large shopping malls (department stores, Zhongbai, Hualian Supermarket) and the prices are very high. Of course, telescopes are also sold in Zhongda Shopping Plaza, electronic markets, single-dong and antique markets, and the prices of similar products are lower than in department stores, Hualian and other places. Influenced by the West, our country also introduced variable-magnification binoculars. This type of telescope has a large zoom range and many uses. 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, its field of view is relatively small, and its chromatic aberration is serious. The performance is good at low magnification. The higher the magnification, the lower the brightness and worse the clarity. At the same time, the offset of the optical axis will also make the observer feel uncomfortable. Even domestic regular products or imported famous brands have the above-mentioned problems to some extent. Its price is also relatively high. The market price of an ordinary 50MM caliber double-barrel zoom type is 300-400 yuan, while the prices of domestic regular products and imported famous brands are higher. I do not advocate everyone to buy a zoom telescope. If you must buy it, buy a domestic (imported) famous brand product. Only in this way can the quality be guaranteed. Generally speaking, when purchasing a zoom telescope, a magnification between 7-20 (standard magnification) is sufficient. As for the multiples as high as 30 or more, let’s not talk about it. Even if you have such financial strength, it is still a waste. If any of your friends are interested in astronomical observation, you may wish to buy a domestic high-quality telescope and mount it on a tripod for observation. Speaking of some of the best telescopes in my country, they are all-metal large-diameter nitrogen-filled waterproof binoculars (single-tube telescopes) newly launched in recent years, medium-diameter nitrogen-filled waterproof binoculars and some non-metallic economical telescopes. These products are great at a great price. Specific models and performance are shown in the table below: Type Model Price (estimate) Introduction Large-diameter high-quality double-cylinder type 20×80 980-3000 yuan Full metal structure, wide angle and large field of view, BaK4 prism, MC/GMC coating, excellent performance. Sealed and filled with nitrogen, waterproof, dustproof and anti-collision. Can be connected to a tripod, suitable for astronomy and ground observation. It is heavy in weight and large in size, so it is not suitable for hand-held observation. Depending on the specific performance, the price gap is also very large.
22×100 1500-3000 yuan 25×100 1700-3000 yuan 30×100 2000-3000 yuan Large-diameter single-cylinder type 65/80/85/100/120 type ranges from several hundred to several thousand yuan MC multi-layer coating, BAK4 Prism, main body is metal or non-metal, can be equipped with a variety of eyepieces, and has excellent optical performance. Can be connected to a tripod, suitable for astronomy and ground observation. Available in straight and collapsible styles. Medium-diameter binoculars 8×40 350 yuan. The main body is made of metal. It is highly sealed and filled with nitrogen. It is waterproof, dustproof and anti-collision. It has a wide angle and large field of view. It has high-quality optical lenses. It is cheap and feels comfortable in the hand. 10×50 380 yuan 12×50 400 yuan Medium-caliber high-quality double-barrel type (LOAVA) 8×45 600 yuan All-metal structure, wide angle and large field of view, BaK4 prism, MC/GMC coating, excellent performance. Sealed and filled with nitrogen, waterproof, dustproof and anti-collision. 7×50 630 yuan 10×50 660 yuan 12×50 700 yuan Economical double barrel 15×60/70 16×60/80 20×60/80 350-700 yuan......>>
Question 8: What brand of telescope? Good quality and cheap! Good quality cheap telescopes simply don’t exist, and good stuff never comes cheap. You can determine the price of the telescope, and others may provide you with suggestions.
Question 9: What are the brands of telescopes? First of all, it is not recommended to be too superstitious about brands, because there are too many fake ones now, and brands can be copied at will, such as the most common ones on the market, such as Bushnell, Bushnell, Kenko, etc. Kenco, Tasco, Debao, Begos, etc., etc., most of them are inferior products and randomly posted. In the past, we could also get some exported goods without any quality problems, but now, the factory requirements are becoming more and more strict. Not to mention those without quality problems, even those with quality problems are not allowed to flow out, and everything is under control. Recently, we want to produce a product for Bushnell in the United States. We have to discuss with the manufacturer whether the brand can be removed and whether it can be provided. Therefore, few of those with foreign trademarks are genuine, and they are becoming increasingly rare. Because the real OEMs are all under control. Another problem is that there are too many inferior products on the market today, accompanied by various false propagandas. In addition to the common counterfeit brands listed above, there are also random brands such as "Sakura", "Night Vision", "See-through", "Infrared" and so on. Publicity, and often used to mislead consumers, such as the magnification, such as hand-held telescopes claiming to be 20x, 30x, 50x, 9999x - many people are fooled. So as long as you take a good look at how to identify regular products, you will be fine. As long as they are regular products, most of them are relatively clear. In this regard, you can look at the three sections of ytwscc/...e, the first section of "Telescope magnifications", the middle section of "Military telescopes" and the last section of "Reasonable selection of telescopes". All involved. Speaking of this, I also think of one thing, that is, when it comes to the choice of specifications, it is recommended to choose a moderate one, not too big, not too small. In addition, generally do not choose a hand-held telescope with variable magnification.