How about Jinan Debao Telescope?

Question: What about the TASCO Debao telescope? Please remind me that apart from the so-called Russian telescope, Japanese cherry blossom telescope and infrared night vision telescope, TASCO and BUSHNELL are the two favorite brands of counterfeit and shoddy products in China.

If it is in the price range of 3 or 400, it is even more cautious. It doesn't matter whether it's expensive or not. Fake ones are generally not very expensive.

With regard to identification, you can look at popular optics, and some basic knowledge is introduced, which is more comprehensive.

Question 2: Is telescope Debao better than Japanese Kengo? Hello, I am a distributor of military optical manufacturers. We are OEM for both brands, obviously Kengo from Japan. Much better.

Tasco, a long time ago, was acquired by BUSHNELL and kept a brand. The product is average.

By the way, can you elaborate on the specifications you chose? what do you think? Specifications are not very standard specifications. Specifications are also important.

About Debao, many things are fake now. Pay attention. Not only Debao, but also many inferior products in the domestic market. Fake and shoddy products account for more than 95% of the market. The trouble is that there are false propaganda, such as "night vision", "infrared", "Japanese cherry blossoms" and "Russia". I suggest you know the basics. You can't just look at the brand, you can make inferior products, and it's not easy to print fake brands: you can look at ytwscc's telescope knowledge and introduction.

Pay special attention to issues such as multiple, military and night vision, that is, the introduction of some common false propaganda. Otherwise, people who don't understand, in such a market situation, are easily deceived.

Question 3: Which brand of telescope is good? What about the brand of the telescope? Europe Department: Zeiss, Germany, Lycra, Austria, Swarovski, Straddle. This is recognized as the "Big Three" of telescopes in the world and a "luxury" of telescopes. Generally, the cheapest telescopes of this brand are all above 3K, and the slightly better ones cost tens of thousands of yuan. These brands of telescopes are excellent. Almost all players don't doubt it. Because of this, many brands always compare their own brands with them and rank together everywhere. It is not common in domestic point of sale. As far as Guangzhou is concerned, they are rarely seen in the white light shopping malls where luxury goods are dazzling. In China, customers are generally telescope lovers, scientific research institutions of agriculture, forestry and mining, school bird watching societies, elderly bird watchers and so on. Due to the high price, the domestic purchase method is generally down payment order.

Japanese brands. In addition to recognized world-famous brands, Japanese brands are also a good choice.

Japanese brands also have very high-end, luxurious and top-level mirrors, and even have their own uniqueness in a certain respect, and surpass the "three major brands"; Another feature is that their product line is relatively complete, with high, middle and low grades. Such brands are: Nikon Telescope, Olympus Telescope, Canon, KOWA and Minox. These brands have certain price advantages and excellent optical quality, so we will often see them in some domestic industries.

American telescope brand is represented by bushnell, and its annual sales and production capacity are quite huge. Occupy a huge market share. Product features: moderate price and excellent optical quality.

Finally, the domestic series of telescopes. As far as domestic sales are concerned, domestic telescopes are nothing more than tube waves and Likoda.

Guanbo's product line is very comprehensive, with various prices and specifications. The coverage in the domestic market is quite huge, which is inseparable from Guanbo Company's consistently excellent brand operation, perfect after-sales service and strong distribution network. In recent years, Guanbo Company has developed rapidly, and has appeared in the bird watching activities of major domestic events for many times.

Nikula is a factory enterprise, which has all kinds of excellent molds, and has been mainly exporting and OEM for famous foreign brands. Its own brand NIKULA attracts a large number of loyal users because of its high cost performance. Especially the infinite boutique of ED mirror, the sniper's 24-72* 100A, has been sought after by fans.

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, which is denoted by the symbol F. The part of the objective lens diameter that is not blocked by the lens frame and diaphragm is called the effective aperture of the objective lens, which is denoted by the symbol D. The performance of astronomical telescope is mainly marked by these two data. The ratio of effective aperture to focal length is called relative aperture, which is represented by symbol A, that is, a = d/f, where d A=D/F is in millimeters.

magnifying power

The ratio of the focal length (f) of the objective lens to the focal length (f) of the eyepiece of a telescope is called the magnification of the telescope, which is represented by the symbol M. An astronomical telescope is usually equipped with several eyepieces with different focal lengths, thus obtaining several different magnifications. For example, when the focal length of the objective lens of the telescope is 840mm and the focal length of the eyepiece is 10mm, the magnification is 84 times, and if the focal length of the other eyepiece is 20mm, the magnification of the telescope is 42 times.

Set the lighting power

Light enters the human eye through the pupil, and the human eye can only collect light equivalent to the pupil area. In the dark, the pupil diameter of the human eye is generally around 7 mm, so the multiple of the effective area of the telescope objective relative to the pupil area is called light collecting ability. That is: light collection capacity =(D*D)/(7*7), where d is in millimeters.

resolution ratio

Due to the diffraction of light, the image of a celestial body in a telescope will become a small disk. If two stars are close enough to distinguish, their minimum angular distance is called resolution, which is expressed by the symbol θ and the unit is angular seconds. The relationship between the telescope resolution and the effective aperture of the objective lens can be roughly expressed as θ= 140/D, where d is in millimeters. For astronomical observation, resolution is often more important than magnification.

field of vision

The angular diameter of the sky area 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 larger the magnification of the telescope, the smaller the field of view.

You can look at these: 1. Bushnell (Doctor) II. Nikon 3. Tasco (debao) 4. y...> & gt

Question 4: What kind of telescope should I buy? Hello, I am a distributor of military optical factory, which produces night vision guns and sights for the army.

If you are interested in the so-called "night vision telescope" that often appears on the Internet, I want to remind you that this is a common false propaganda of inferior products on the market now.

I don't know if you understand that the so-called "how far to look" and "night vision telescope" are all common deceptive propaganda of some inferior products. -There's no such thing.

If we follow this "guiding ideology", I'm afraid it's easy. .

You can pay more attention to the vicinity of the local gymnasium.

There is also concern about optical shops and photographic equipment stores, sometimes this happens. Ordinary shops may not be easy to find.

However, there are a large number of counterfeit products, which account for more than 95% of the market. The trouble is that there are false propaganda, such as "night vision", "infrared", "Japanese cherry blossoms" and "Russian", so I suggest you know the basics: you can look at the basic recognition of one.ytwscc/...e..

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

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What you can really see at night is the night vision device, which needs electricity and relies on the amplification and excitation of some electronic components to image and enhance the weak light in nature at night.

The cheapest may be more than 1000 yuan, and the effect below 2000 yuan is very poor.

Night vision goggles are completely different from telescopes. Night vision goggles are hardly magnified, only 2 ~ 3 times, so they can't be used during the day. And the definition must be far from that of a telescope, because it is screen imaging.

Question 5: Which brand of universal telescope is good? 10 points Europe: Zeiss, Germany, Leica, Swarovski, Austria, straddle. This is recognized as the "Big Three" of telescopes in the world and a "luxury" of telescopes. Generally, the cheapest telescopes of this brand are all above 3K, and the slightly better ones cost tens of thousands of yuan. These brands of telescopes are all excellent. Almost all players don't doubt it. Because of this, many brands always compare their own brands with them and rank together everywhere. It is not common in domestic point of sale. As far as Guangzhou is concerned, they are rarely seen in the white light shopping malls where luxury goods are dazzling. In China, customers are generally telescope lovers, scientific research institutions of agriculture, forestry and mining, school bird watching societies, elderly bird watchers and so on. Due to the high price, the domestic purchase method is generally down payment order.

Japanese brands. In addition to recognized world-famous brands, Japanese brands are also a good choice.

Japanese brands also have very high-end, luxurious and top-level mirrors, and even have their own uniqueness in a certain respect, and surpass the "three major brands"; Another feature is that their product line is relatively complete, with high, middle and low grades. Such brands are: Nikon Telescope, Olympus Telescope, Canon, KOWA and Minox. These brands have certain price advantages and excellent optical quality, so we will often see them in some domestic industries.

American telescope brand is represented by bushnell, and its annual sales and production capacity are quite huge. Occupy a huge market share. Product features: moderate price and excellent optical quality.

Finally, the domestic series of telescopes. As far as domestic sales are concerned, domestic telescopes are nothing more than tube waves and Likoda.

Guanbo's product line is very comprehensive, with various prices and specifications. The coverage in the domestic market is quite huge, which is inseparable from Guanbo Company's consistently excellent brand operation, perfect after-sales service and strong distribution network. In recent years, Guanbo Company has developed rapidly, and has appeared in the bird watching activities of major domestic events for many times.

Nikula is a factory enterprise, which has all kinds of excellent molds, and has been mainly exporting and OEM for famous foreign brands. Its own brand NIKULA attracts a large number of loyal users because of its high cost performance. Especially the infinite boutique of ED mirror, the sniper's 24-72* 100A, has been sought after by fans.

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, which is denoted by the symbol F. The part of the objective lens diameter that is not blocked by the lens frame and diaphragm is called the effective aperture of the objective lens, which is denoted by the symbol D. The performance of astronomical telescope is mainly marked by these two data. The ratio of effective aperture to focal length is called relative aperture, which is represented by symbol A, that is, a = d/f, where d A=D/F is in millimeters.

magnifying power

The ratio of the focal length (f) of the objective lens to the focal length (f) of the eyepiece of a telescope is called the magnification of the telescope, which is represented by the symbol M. An astronomical telescope is usually equipped with several eyepieces with different focal lengths, thus obtaining several different magnifications. For example, when the focal length of the objective lens of the telescope is 840mm and the focal length of the eyepiece is 10mm, the magnification is 84 times, and if the focal length of the other eyepiece is 20mm, the magnification of the telescope is 42 times.

Set the lighting power

Light enters the human eye through the pupil, and the human eye can only collect light equivalent to the pupil area. In the dark, the pupil diameter of the human eye is generally around 7 mm, so the multiple of the effective area of the telescope objective relative to the pupil area is called light collecting ability. That is: light collection capacity =(D*D)/(7*7), where d is in millimeters.

resolution ratio

Due to the diffraction of light, the image of a celestial body in a telescope will become a small disk. If two stars are close enough to distinguish, their minimum angular distance is called resolution, which is expressed by the symbol θ and the unit is angular seconds. The relationship between the telescope resolution and the effective aperture of the objective lens can be roughly expressed as θ= 140/D, where d is in millimeters. For astronomical observation, resolution is often more important than magnification.

field of vision

The angular diameter of the sky area 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 larger the magnification of the telescope, the smaller the field of view.

You can look at these: 1. Bushnell (Doctor) II. Nikon 3. Tasco (debao) 4. y...> & gt

Question 6: I want to buy a telescope. I haven't bought it. Let's see if Taobao is also very cheap. First of all, it depends on its optical performance, followed by its mechanical performance (pointing accuracy and tracking accuracy). Optical performance is usually measured by the following indicators.

1, effective aperture: refers to the light passing diameter of the objective lens, that is, the entrance pupil diameter of the telescope (denoted by d). The larger the effective aperture of the telescope, the stronger the focusing ability, and the more dim celestial bodies can be observed. Reflects the ability of telescope observation.

2. focal length: the focal length of the telescope mainly refers to the focal length of the objective lens, which is expressed by F. The focal length of the objective lens is the main symbol of the negative 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 a telescope to its focal length, also called focal ratio, which is usually expressed by a, and a = d/f. The larger the effective aperture, the better the observation effect, because their imaging illumination is directly proportional to the square of the telescope aperture. The relative aperture of refractive telescope is relatively small, generally ranging from 1/6 to115 (medium focus). The relative caliber of reflecting telescope is relatively large, generally ranging from 1/3.5 to 1/5. When observing celestial bodies, we should pay attention to choosing appropriate effective aperture and focal ratio.

4. Magnification: refers to the angular magnification, which is the ratio of the focal length (f) of the objective lens to the focal length (F') of the eyepiece. It is also equal to the ratio of entrance pupil to exit pupil. So as long as you change different eyepieces, you can change their multiples. However, due to the influence of objective resolution, atmospheric vision quietness, exit pupil diameter and other factors, the magnification of the telescope cannot be increased indefinitely. Generally, it is advisable to control it at 1-2 times the diameter of the objective lens (the maximum is not more than 300 times).

5. Resolution: The resolution of the telescope is measured by the reciprocal of the resolution angle of the telescope. The resolution angle is the minimum angular distance that a telescope can resolve, which is expressed by δ. It is the angular distance between two luminous points on the celestial sphere, which can be just distinguished by a telescope.

6. Angle of view: the angular diameter of the starry sky corresponding to the area where the telescope can image well, expressed by ω. Is inversely proportional to the magnification of the telescope. Different focal lengths, different optical systems and masses (aberrations) determine the size of the telescope's field of view. Generally, the field of view of popular science reflecting telescope is less than 1 degree.

7. Visibility: refers to the weakest magnitude that can be seen in the zenith direction with a telescope on a clear moonless night. Under better conditions, the stars that can be observed by human naked eyes are six stars. The visibility of telescope is mainly related to its effective aperture, relative aperture, absorption coefficient of objective lens, atmospheric absorption system and sky background brightness. Popular astronomical telescopes can generally observe the magnitude of Venus 10- 12.

Configuration refers to the spare parts of the telescope except the main mirror body and angle bracket, which generally include eyepiece, star finder, magnifying glass, upright mirror and other main accessories, which basically meet the use requirements. "Debao" telescope is also equipped with filters, camera interfaces, mobile star maps and other accessories to meet the needs of users to a greater extent, and there is no need to buy related accessories.

1, eyepiece; A good astronomical telescope is usually equipped with multiple eyepieces. To meet different observation needs, so as to maximize the value of the telescope itself. When people investigate and know the telescope, they often only pay attention to the objective lens of the telescope, but ignore the eyepiece as the terminal of the telescope. As a result, the telescope can't play its due role and can only look up at the sky and sigh. The eyepiece has two main functions: one is to enlarge the image formed by the objective lens; The second is to turn the outgoing beam into parallel light, which is more comfortable and convenient to observe. There are many kinds of eyepieces, and there are three commonly used ones: Huygens (H), which is suitable for medium and low magnification observation; Ranstern (R), this kind of eyepiece is also suitable for middle and low magnification observation; Kainar (K) is an improved version of Langsdon, which eliminates the chromatic aberration of Langsdon. This eyepiece has a large field of view and is often used for low magnification observation, such as comets or large-area celestial bodies. There are also Steinhar's monocular lens, Chase's undistorted eyepiece, Abbe's undistorted eyepiece and Hick's undistorted eyepiece.

2. Star finder: In order to quickly find the target to be observed during observation, a star finder is usually attached to the main mirror to help you aim at the target. Its optical axis is parallel to the main mirror, thus keeping consistent with the goal of the main mirror. The general star finder has a small multiple and a large field of view, and a reticle is installed at the focal plane to calibrate the target. When observing, first use the star finder to find the target to be observed and adjust it to the center of the field of view. The object to be observed will naturally be in the field of view of the main mirror.

3. Magnifier: Magnifier is used to extend the focal length of the objective lens and increase the magnification of the telescope. I. > >

Question 7: 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 ... > >

Question 8: What brand of telescope? Good quality and low price! Good and cheap telescopes don't exist, and good things are never cheap. You can set a price for the telescope, and people may give you a reference.

Question 9: What are the brands of binoculars? First of all, it is not recommended to be too superstitious about brands, because there are too many fakes now, and they are all casually copied, such as bushnell, Bosch, kenko, Kenko, tasco, Debao, Bergo and so on. Most of them are inferior products, and they are pasted indiscriminately. As before, we can get some export goods without any quality problems, but now, the requirements of the factory are becoming more and more strict. Don't say that there are no quality problems, all of them have quality problems and are not allowed to flow out. They are all under control. Recently, I want to make a product for bushnell in the United States. I have to discuss with the manufacturer whether I can remove the brand and provide it again. Therefore, few foreign trademarks are true, and there are really fewer and fewer. Because the real OEM is responsible. Another problem is that there are too many inferior products on the market now, accompanied by all kinds of false propaganda. In addition to the common counterfeit brands listed above, there are also random propaganda such as "cherry blossom", "night vision", "perspective" and "infrared ray", and people who are often used to mislead consumers, such as those who claim to be 20 times, 30 times, 50 times and 999 times. So as long as we take a good look at how to identify legitimate products, that's fine. As long as it is a regular product, most of them are clear. In this regard, you can look at ytwscc/...e and the "Reasonable Choice of Telescopes" at the end. Are involved. Speaking of this, I also think of one thing, that is, in the choice of specifications, it is recommended to choose a moderate one, not too big or too small. In addition, generally do not choose zoom hand-held telescope.