1. Uses you need to know: Whether to watch sports games, outdoor travel, or bird watching, star watching, or balcony viewing for different purposes, the requirements for the volume and weight multiples of the telescope are not the same.

2. It is necessary to clearly inform the psychological price: the same, the price can be from a few yuan to yuan, or even more than double the product of similar specifications, the same price may also be relatively large, only a certain price is the best recommendation.

3. It is necessary to believe that the experience of the old players is obtained by spending a lot of money and time. If you don't want to pay tuition, the old players think you are just sitting in front of the computer, and the players must play hard. A long time and many products.

4. Don't be too indifferent to products that no one cares about: a novice who can see that the selection of high-quality products that have not been discovered by the player is almost 0 in the astonishing products.

5. Don't think with high-level choices: I want to zoom, zoom, pocket, look at XX 10 kilometers away, etc. Desires must be real and realistic-basic physical habits and how high prices you can control, no dream Meaningless.

6. Don’t substitute intuition for thinking: For example, high magnification is better than low magnification, zoom is better than fixed magnification, military is better than civilian use, imported brands are better than domestic brands, large sales are better than small sales, and big brands are better than niche brands. Wait, don't jump to conclusions, read more, ask more and think.

7. Resist the temptation: The product introductions of many low-end Amoy brand telescopes boasted that there is nothing in the sky, and there is nothing on the ground. You just think: Why is it so good to sell so cheap? Is it wrong for the ancients to say that it is wrong to buy the essence that will never be sold? The economic law of one cent for the price, one for the goods is also invalid?

8. Learn to compromise: make reasonable trade-offs among factors such as price, size, weight, multiples, caliber, brand, etc. Don't hope everything is as you wish, only a liar will tell you that his product meets all your requirements.

9. Read posts and discuss more in different QQ groups, post bars, forums and other places, confirm each other's rational analysis, and read less product descriptions written by merchants, which are full of plausible and misleading information. Newcomers lack the ability to distinguish and are easily fooled.

10. Learn to trust. Not everyone is a liar. There are always people who are trustworthy. What they say may not sound good or be as you wish, but they are just against your ears. Be open-minded, let your guard down and communicate with everyone, you will gain More.

What does something like 8x30 mean?

The specifications of binoculars are often expressed by numbers like 8x30. 8 means that the telescope has 8 times magnification and can shorten the distance of the observation target by 8 times. For example, a target 800 meters away can be observed and imaged by an 8 times telescope. The size is as large as the direct observation with the naked eye at a distance of 100 meters (affected by atmospheric interference and the quality of the telescope, the observation effect is not as good as the direct observation with the naked eye at a distance of 100 meters). And 30 means that the objective lens of the telescope is 30 mm in diameter. The larger the number, the brighter and clearer the image, and the more comfortable the observation. However, the volume, weight, and price of the corresponding telescope will increase.

Why not recommend zoom binoculars？

In the imagination of many newcomers, if the picture in the telescope can be large or small, it should be far and near, what a great thing! In fact, this is just a beautiful imagination! From an optical point of view, zoom products are difficult to make. Friends who play photography know that the effect of fixed focus lenses is better than zoom lenses. Low resolution, small field of view, and large distortion are common problems of zooming. Moreover, binoculars are linked by two sets of zoom eyepieces. The mechanical structure is also very complicated, especially the positioning of the zoom binoculars is generally very low, and the cost control is demanding. The material and precision of the parts are low, so the common problems of optics are more serious, the failure rate of the structure is also higher, and the optical axis is almost more or less offset. So we never recommend zoom binoculars, nor do we sell zoom binoculars. For the zoom monocular, the structure is much simpler, there is no linkage problem, and there is no problem of non-parallel optical axis, so even a very cheap bird watching mirror, the effect is acceptable.

What multiple is more suitable?

Generally speaking, holding binoculars with 7-10 times is enough. Too high a multiple will cause many problems (large imaging jitter, small field of view, low brightness, etc.), and serious brands generally do not use high multiples! Many Amoy brands like to mark dozens of times and hundreds of times, which are all deceptive. If you can mount a tripod, the multiple can be higher, the single tube can be 20-70 times, and the double tube can be 20-30 times. Note that the magnification must be matched with the aperture. Simply increasing the magnification without increasing the aperture will result in poor imaging.

What caliber is better?

The larger the diameter of the telescope, the better the observation effect, but the more expensive it is, the larger the volume and the heavier weight, and the smaller the diameter, the observation effect is almost the same, but it is small in size and light in weight and easy to carry. Generally, you can choose a double tube with a diameter of 20-50 mm. If you use a tripod, you can choose a diameter of 50-100 mm.

Common specifications and scope of application

10x25-pocket size, suitable for carrying and traveling outdoor concerts, but not suitable for occasions with low light

8x32-Moderate type, suitable for general daily use, both effect and portability

8x42, 10x42-full-size, very comfortable observation, suitable for different lighting environments, slightly larger volume and weight

7x50-low light type/navigation type/stargazing type, this specification has excellent observation comfort, good imaging stability, high brightness in low light environment, but the volume and weight are too large, not suitable for general daily use

10x50——Balcony type, this kind of specification has high multiples and high brightness, but the image is slightly jittered. It is necessary to find objects to lean on when observing, and the volume and weight are too large, so it is not suitable for going out.

12x60, 15x70-balcony reinforced type, large diameter, high multiples, large jitter, better observation effect with tripod, large volume and weight, not suitable for outing use

20x80, 25x100, 28x110-sentry type, extremely high multiples, large diameter, strongest remote observation ability, must be used with a tripod, the weight and volume are also very large

Choose Paul prism or roof prism telescope?

The advantage of Paul prism telescope is low price and good effect, but the volume and weight are about 40% larger than the roof prism telescope of the same specification. The nearest observation distance is far, and it is not suitable for bird watching and other occasions that require close observation.

The advantages of roof prism telescopes are small size and weight, good portability, short observation distance, suitable for bird watching, but high technical requirements, cheap models cannot obtain excellent picture quality.

Generally speaking, when the budget is less than 300RMB, unless the volume and close-range observation are particularly emphasized, the Paul telescope is preferred. If the budget exceeds 300 RMB, the roof prism telescope can be considered. The budget is more than 1000, and the roof prism telescope is mainly recommended.

Binocular or monocular?

In terms of observation effects, the binoculars of the same specification have much better effects than the monoculars. The image is rich in three-dimensionality, the resolution is higher, the imaging is bright, and the observation is more comfortable. However, the volume and weight of the monoculars is more than half smaller than that of the binoculars of the same specifications. , The single tube is easier to achieve high magnification zoom, such as bird watching mirror. Therefore, for handheld telescopes, binoculars are recommended for better results, and monoculars are recommended for lighter volume. If you can use a tripod and want to obtain a high magnification zoom effect, a monocular bird-watching mirror is recommended.

How many ways to express the field of view?

The common methods include degrees, xxx meters/1000 meters, xxx yards/1000 inches, etc. Taking 125 meters/1000 meters as an example, it means that when a telescope is used to observe a target 1000 meters away, the range that can be seen is a circular area with a diameter of 125 meters. In addition, take an 8x telescope with an actual field of view of 7.5 degrees as an example. Although the actual observation range is only 7.5 degrees, because the telescope has an 8x magnification, the apparent field of view is 7.5x8=60 degrees, and it does not feel cramped for observation. A telescope with an apparent field of view of more than 60 degrees can be regarded as a wide-angle telescope.

The algorithm and meaning of exit pupil diameter?

Exit pupil diameter = telescope objective lens aperture ÷ magnification, such as 8X30 size telescope, exit pupil diameter = 30÷8=3.75 mm, if the exit pupil diameter is less than 3 mm, such as 8X21, 10X25 specifications, generally only suitable for a well-lit environment Next observation. The exit pupil diameter exceeds 5 mm. For example, the 8X42 and 7X50 specifications can be observed in low-light environments (dusk, dawn, moonlit night, etc.). The telescope cannot observe in a completely dark environment.

What is the difference between Paul prism and roof prism?

If there is no prism rotation, the image we see is an inverted image. The prisms often used in handheld telescopes are divided into Paul prisms and roof prisms. Paul prisms are used for good imaging effect and low price, but the volume and weight are too large. The use of roof prisms has small volume and weight, but has the shortcomings of double aberration, phase difference, and inability to total reflection. It is necessary to use high-precision prisms, phase films and high-reflection films to overcome these defects, resulting in relatively expensive telescopes.

What is the difference between BAK4 and BK7?

Paul prism often uses two kinds of lenses, namely BAK4 and BK7. The former has a high refractive index and the entire field of view can achieve total reflection, while the latter has a low refractive index and the edge of the field of vision cannot be totally reflected. Therefore, the imaging effect in the center of the field of view is the same, and the image of the edge of the field of view using BK7 will be darker than that of BAK4. However, the human eye's attention is mainly concentrated in the center of the field of view, so the prism imaging effect of the two materials is not much different. The ex-factory price of BAK4 prisms is more expensive than BK7, so low-end Paul prism telescopes often use BK7 prisms. Hold the telescope with your eyes 30 cm away from the eyepiece and observe the shape of the pupil spot. If it is a bright circle, it is a BAK4 prism, and if it is a circle with 4 vignetting edges, it is a roof prism. For roof prisms, it doesn't matter what material is used. Many roof prisms also claim to use BAK4 prisms, which are basically commercial propaganda and have no technical significance, and it is impossible to judge the material used with the naked eye.

What is the role of antireflection coating?

There are multiple sets of lenses inside a telescope, and each set of lenses has two reflecting surfaces. If no antireflection coating is applied, at least 50% of the light will be consumed by the reflection on the surface of the lens, which will seriously reduce the image brightness and the contrast. The image is foggy. Therefore, it is necessary to plate an anti-reflection coating on the surface of the lens to reduce reflection. The most traditional antireflection film is a single-layer film, which is blue in reflection, commonly known as blue film. The multi-layer antireflection film has better antireflection effect, and the reflection is mostly green, commonly known as green film. Based on this feature, many manufacturers deliberately manufacture low-cost single-layer green reflective films, commonly known as decorative films, which are harmful to imaging. Everyone must be vigilant. The color of the coating is not the key. The key is to see whether the reflected light is weak. The weaker the light, the lower the reflection and the better the anti-reflection effect.

What is the effect of nitrogen filling and waterproofing?

Nitrogen-filled and waterproof telescope, the inside is filled with dry nitrogen, the moisture in the air cannot penetrate into the inside, the inside of the lens will not grow mold, it can be maintained and used for a long time, suitable for various outdoor activities.

Is the best telescope a military telescope?

Absolutely not, military telescopes are used in battlefield environments, mainly emphasizing sturdiness, durability and high reliability, and low requirements on optical quality and details. The effect of the so-called Type 62 military telescope is not as good as the Onick Polar Eye 10x42 telescope. In the past, only troops were equipped with binoculars, and ordinary people couldn't afford it (you can change a panda binoculars without eating or drinking half a year's salary), so the myth that military binoculars works well. In addition, with the development of optoelectronic technology, the role of telescopes in the army has continued to decline. If ordinary people don't have a military plot and don't go over the mountains every day, they shouldn't buy military binoculars, which is extremely impractical.

Center focus or left and right focus?

General civilian telescopes use central focusing. This method of focusing is convenient and fast. Military telescopes generally use left-right focusing. This focusing method is more helpful to maintain the tightness of the telescope. Generally, central focusing is recommended for daily use.

What happened to the military binoculars sold on the street?

At highway service stations and roads, there are often soldiers in green jeeps and camouflage uniforms selling binoculars. The reason is that they lack money to buy cigarettes, and they stole a few binoculars from the army and sell them at low prices. Such people are not soldiers at all. Are all liars, and binoculars are all street vendors! Can the troops' stuff be stolen at will? Don't be fooled.