Detailed explanation of the parameters of the bilateral Telescope purchase method is to answer what kind of good binocular Telescope

We often hear friends who come to buy a Telescope and ask, "How far can your Telescope look at?", "Can your Telescope be more doubled?", "How can your Telescope be put in the sky?" ...This problem reflects the public's lack of Telescope and astronomical knowledge.

The so -called "see how far" and "how big" are not scientific nor meaningful, and the quality of the Telescope is by no means this way.

In fact, "how far to see" depends entirely on the brightness of the observed target. As long as the goal is bright enough, we can see infinite distance without a Telescope. For example, we can see about 6,000 stars that we can see with the naked eye.In the end of infinitely; and "how big" is the problem that the basic knowledge of astronomy will be raised, this is because we see "the stars in the sky" or more are stars, and the stars are so far away from us, soEven if they are observed with the largest Telescope on the earth, they are still just geometric highlights (the smaller the highlights, the higher the quality of the optical imaging of the Telescope; on the contrary, if you see the stars in the Telescope, the stars have vision noodles or even the color, then there are colors, then there are colors, then there are colors, then there are colors, then there are colors, then there are colors, then there are colors.It can be determined that its optical system is seriously ill). Only the celestial bodies in the Solar system (such as the Solar, planets, satellites, comets, etc.) or the celestial body (such as Nebula, Galaxy, Star Group, etc.) outside the Solar system can use the Telescope.

So is the "magnifying multiple" the performance indicators that must first consider when buying a Telescope?Definitely not!Not only does it not be ranked first, but if it is too large, it will cause the image quality to worsen seriously.

Betal (Yisuke is 8 times to 10 times)

The Telescope is marked with the words of 10 x 42, 8 x 30.Look at a 10 -fold Telescope to see a bird standing in 100 meters, as close to 10 meters with the naked eye.Due to the large rate of multiple, the smaller the perspective, the more difficult to search for the goal, and it is more likely to affect the clarity due to the trembling of the hands.When the light is very sufficient, it is clearly 10 times compared to 8 times; when the light is insufficient, 8 times can see the details than 10 times, so you should not blindly pursue a high mortar rate.

Activation (Yisuke 30mm to 42mm)

The larger the diameter, the better the diameter of the objective mirror affects the amount of light.Especially in the case of strong comparison of light and darkness, morning and dusk, and cloudy, the larger the diameter, the higher the light inlet, the more details can be seen in the eyes; but at the same time, the heavier the Telescope, and the long -term watching is more difficult to cause fatigue.It is advisable to choose a larger caliber according to your personal body.

Vision (the bigger and better)

The field of vision refers to the range that can be seen at 1000 meters. The width of the field of vision should be higher than 104 meters, which is 6 degrees.The greater the vision, the faster and easier to search for the goal.However, when the field of vision is larger, the more serious the edge is distorted and blurred. The more complicated the correction of the aberration, the higher the required technology and cost.

color guarantee (the better the more natural, the better)

High -quality Telescope must faithfully reflect the primary color and saturation of the scenery.In order to increase the brightness of the Telescope, some manufacturers deliberately increase or decrease a certain optical waves, causing distortion to make the scene blue or reddish.

The relationship between light transmission and coating is inseparable and directly affects color conservation.All optical glass high light transmission and full surface multi -layer coating, the brightness is relatively high, and the color is accurate.Generally, manufacturers will not announce all data (it is difficult to do), and some manufacturers will announce the light transmission or coating of local optical glass to mislead consumers.

Use performance

Depth of field

For the bird watching people, the depth of field is a more contradictory parameter. The depth of the field does not need to be frequent, it is more convenient to use, but for observing the forest birds, the prospects and backgrounds are not easy to blur.protrude.The depths of the field are small. Although the forest and birds are obvious and the background blur is obvious, and the theme of the birds is prominent, when the distance changes, it is necessary to re -focus. The fingers must always be on the coking wheel, which is more tired.This depends on personal preferences, there is no fixed standard.

Sealing

Wangyuan is often carried out outdoors. Observation environment is changing. It is best to choose a Telescope with water -proof water (water pressure and waterproof), so that the interior of the mirror can be kept sealed and stable.

Comfortable

Comfort varies from person to person.Generally speaking, the Telescope of the surface of the surface not only has good shockproof effects, but also more comfortable to hold; the weight of the mirror body determines whether it is convenient to use and carry for a long time; usually, everyone will choose a Telescope with high durability.

[Margion bed folding bed] What are the precautions for buying a multi -functional marching bed?

Is the multi -functional march bed easy to use?

Because the folding bed is convenient and easy to carry, it can often play an unusual role in outing or field projects.Some people will bring a Tent when they go out to solve the problem of sleep, but people can also bring a folding bed, so that they can enjoy the most comfortable home experience with the smallest space.If you can meet different grasslands with a folding bed, it can adjust the height of the folding bed within a certain range, so that people lying on it can feel more comfortable.Any component can be folded up. After folding it, it is like a large leather box. After wrapping it with a special packaging bag, it is convenient to put it in any corner. It is a good choice for home tourism.

What are the precautions for the purchase of military folding beds?

The marching bed is designated by the production unit after providing a professional department for military departments, and some troops are distributed uniformly as needed.Principles are not used by non -military personnel.However, with the extensive use of people, more and more people are Outdoor leisure, Camping, and the needs of accompanying in the Hospital. There are more and more varieties, which are loved by people.There are many brands on the market for personal Outdoor enthusiasts or Outdoor workers.There are different brands, different specifications, different materials, and different good and bad.Because the marching bed does not have a unified market civil standard, there is a certain difficulty in supervision and distinction.Therefore, you must carefully check the quality of the product. You must pay attention to the following matters when buying the military bed:

1. Look at elasticity: Lie down in person, and turn around a few times. A good spring will not be moved or uneven, and can immediately restore the original shape.

2. Look at the stability: You can use both hands to shake and shake the product back, left and right, and shake the product, firmly explaining that the framework is good.

3. Pay attention to the quality of the bag: If you buy the leather, you can use the tip of your two fingertips to pull one place and pull it up. The feel is powerful.

4. Look at the process: If it is a folding bed of the steel frame structure, pay attention to the smoothness, gap without gaps at the welding, the coating looks uniform and soft, and the surface of the steel pipe treated by [plastic spray process], high hardness, more resistant to resistance, more resistant to resistanceMo, more shiny.If the [paint] process is used, the surface of the steel pipe is more likely to produce scratches and cause it to oxidize and rust, and there is no gloss.

5. Whether the folding bed is firm and whether the bed foot will shake left and right,

6. Is the folding bed folding convenient.

What are the characteristics of military folding bed

1. Convenient: It can be easily folded for people to rest, and the bed is soft and moderate.

2. Widely used place: military folding beds can be used in the wild, and can be used in the family at the same time. It is more convenient. At the same time, it is very convenient to carry.

3. Various types of colors, you can choose according to your hobbies.

4, durability: general military products are very durable.

5. Firm, durable, beautiful and generous, product fabrics are resistant to aging, tearing, even use in winter, it is not easy to damage.

1. Where can I sell sunscreen sleeves

The weather in summer is hot and the ultraviolet rays are strong. Wearing sunscreen sleeves when going out can protect the arms and reduce the risk of sunburn and sunburn. Most sunscreen sleeves on the market can indeed play a certain effect.Buy or large supermarkets to buy, it is also very convenient to buy online.

The price of sunscreen sleeves on the market is not expensive. As long as a dozen dollars are cheap, it is generally a product of 40, 50 to 70 yuan. You can choose according to your needs and budget when you buy.More Sleeve price reference & gt; & gt;

2. How to buy good sunscreen sleeves

There are many sunscreen Sleeve products. If you want to buy good sunscreen sleeves, you can start from the following aspects:

1. Pick color

The more sunscreen Sleeve reflects, the less absorption, the more obvious the Sun protection effect. Generally speaking, the sunscreen effect of dark sunscreen sleeves such as black and red will be better.

2. Select material

(1) Polyester material: In the molecular structure of polyester, it contains a molecule called benzene ring. The benzene ring can play a good role in preventing ultraviolet rays from bringing damage to the Skin through the cloth, and the Sun protection effect is very good.Therefore, if the sunscreen is needed, you can choose the sunscreen Sleeve of polyester material.

(2) Solidament material: Solida is an elastic fiber, which has good elasticity, sweat resistance and abrasion resistance, but the Sun protection effect is relatively weak. If you need good elastic Sleeve sleeves, you can choose spandex sleeves.

(3) Ice silk material: Ice fiber has good hygroscopic, Smooth and cool, and good breathability. It has a certain function of protecting ultraviolet rays.Essence

3. Look at density

In order to improve the sunscreen effect, sunscreen sleeves and sunscreen jackets usually add a certain amount of sunscreen auxiliary to the fabric. The sunscreen Sleeve sleeve density of the sunscreen auxiliary treatment is greater.Products.

Kind tips:Sleeve sleeves should be selected as much as possible to choose products with high comfort and good breathability. In addition, although sunscreen sleeves have a certain sunscreen effect, if you want to get a good sunscreen effect, you still need to wear sunscreen sleeves on the basis of wearing sunscreen sleeves.Put on sunscreen.

[military Telescope Buy] How to choose a military Telescope for military Telescopes for military Telescopes?

The basic principle of military Telescope is no different from ordinary civilian Telescopes, but it has higher requirements for the use environment, and the ability to observe the goals is clearer and stronger. This is the main difference between the existence of civilian Telescopes.The shell of the military Telescope is basically metal instead of plastic to ensure that it does not crack or deform after long -term use.In contrast, because of the different use environment and various requirements, ordinary civilian Telescope not only uses plastic shells, but also plastic in the internal lenses.

Buying a military Telescope, first of all, their optical systems are different.Most of the military Telescope has a branch board, and its split boards used at night also have lighting.The pupil distance of the military Telescope is relatively large, so that the observer can wear anti -virus masks.In order to prevent hitting the head during shooting, some aiming mirrors are as large as seven or eighty mm in pupils, and they must also have a moderate and moderate eye mask and lip. These obviously civilian Telescopes will not be considered.

In terms of optical performance and structural performance, the military Telescope is more excellent because its design is more cautious, with excellent materials and sophisticated craftsmanship, such as good quality and lack of mixed gitons.This also makes it more reliable in a harsh environment.

Due to high quality requirements, military Telescope must be tested before leaving the factory. Generally, it includes vibration tests, high temperature (1055 C) test, low temperature (one 45 C) test, rain or water -dip test, and gas tight test.After these experiments, product performance can still be guaranteed to leave the factory within the specified range.Some products also have their own dryer in the mirror body. When the factory is removed from the factory, the air is poured into the dry air or nitrogen to effectively prevent the internal lens from growing mildew in the future.Ordinary civilian Telescope generally does not do environmental tests, or only part of the test.This is difficult to understand from the market, and it cannot be seen from the product appearance alone.

Due to these differences, the design and manufacturing of military Telescopes must be much high, so its price is higher than that of ordinary civilian Telescopes.

From the above, the military Telescope is a special Telescope for the army of various countries, and it is essentially unable to enter the civilian field.

If you are not very familiar with the Telescope, it is recommended that you do not buy a military Telescope. The concept of military Telescope on the market now is stolen by many small manufacturers.The quality and quality cannot be guaranteed at all.

Do not buy a military Telescope because of the concept of military Telescope.In fact, a simple understanding knows that if it is a military Telescope, the country will not be sold.This is a military product.

There are wonderful tricks for the authenticity of the military Telescope

First, look at the material.military Telescope, all made of metal, strong sealing, waterproof and dust -proof, and anti -resistance, sturdy and durable.Some fake Telescopes on the market are hard -plastic shells inside, with camouflage, black, and gray -white rubber Skin on the outside. Its solidity and sealability are very poor and are easily damaged. The interior is easily invaded by water and dust.

Once the Telescope is invaded by water and dust, the observation effect will deteriorate.More importantly, all the military Telescope uses high -quality optical lenses. All lenses are plated with high -quality light orchids, light purple, and pale yellow to increase the coating. The prism is BAK4 material. The eyepiece is designed with a wide -angle field, making the Telescope clear.The degree is extremely high, and the observation field is extremely broad and sharp.

The fake Telescope uses ordinary or inferior optical materials. It has a bright red film on the lens. It is known as the "infrared night vision" function.In fact, it is not an infrared Telescope at all. The actual observation has a sense of vagueness and dizziness, and the optical performance is very poor.

Second, look at the appearance.The appearance of the military Telescope is generally black, and a few are camouflage.Both are painted on the metal or decorated with cadmium sulfide, and have metal sounds with a small hammer.In addition, there is a yin text number on the metal mirror.The fake Telescope, the appearance of camouflage or black rubber, has silver -white paint on the hard plastic shell, looks like metal, but it is not.Some also have a northern needle, coordinates, and mirrors with Russian, Russian emblems, cannons and red stars printed on the body. The red flash coating lens is also decorated with red star or eagle patterns.

Third, look at the three parameters indicating the performance of the Telescope: multiple, objective mirror inlet pores and vision value.The most important parameters are multiple and objective mirror inlet pores. The specifications of the Telescope are represented by these two parameters.For example, "8 30" indicates that the Telescope multiples are 8 times and the inlet pores of the object mirror are 30 mm.Generally, the handheld military Telescope multiples are between 6 and 20 times, of which 6 to 10 times are the best, and more than 10 times should be configured with triangle.Otherwise, the observation effect will become poor due to the impact of the shake, heartbeat, breathing and air flow of the hand.& gt; & gt; What does a Telescope multiplier mean

The regular military Telescope, the magnification is real, and the optical performance is extremely excellent.The fake Telescope is tens, hundreds, and thousands of times. It is claimed that it can see tens of hundreds of kilometers, and its true multiplier rate is generally between 3 and 6 times.A handheld binocular Telescope, which is more than 20 times by its standard, can be determined that it is a fake Telescope. If the reader and friends then refer to the comprehensive judgment of the knowledge mentioned earlier, it is not difficult to identify the authenticity of the Telescope.

Electroplating Sterstory Selection Purchase Guide

1. Product structure

The electroplating goggles are mainly composed of three parts: lens, frame and nasal pad.The lens should be anti -fog and ultraviolet prevention, so as to keep clarity and avoid sunburn.The frame should be durable and not easy to deform, which can be used for a long time.The nasal pads should be soft and fit the bridge of the nose, which can reduce the impact of water flow.

2. How to choose the product

When choosing an electroplating goggles, you need to consider your face and eyes, and choose the appropriate size and style.Secondly, pay attention to the material and quality of the swimming moster, and try to choose soft, durable, and waterproof materials as much as possible.Finally, you also need to consider the additional functions of the product, such as whether there is a degree, whether it is equipped with anti -fog coating, etc.

3. Product advantage

The electroplating goggles can effectively prevent water from entering the eyes and avoid eye irritation and infection; secondly, it can provide better sight and comfort; in the end, it can protect the eyes from ultraviolet damage.

4. Use scenarios

The plating goggles are suitable for various swimming scenes.Whether it is Outdoor swimming or open waters, you can use electroplating goggles.In addition, the electroplating goggles can also be used in water activities such as diving and underwater photography.

precautions for electroplating swimming mirror selection

1. Size and adaptation

It is very important to choose an electroplating goggles suitable for your size. Make sure that the swimming moster can completely cover the eye area without having a discomfort.When trying to wear a swimming mirror, make sure they fit the facial faces tightly, but it will not be too tight or cause discomfort.

2. waterproof performance

High -quality electroplating mirrors should have good waterproof performance to prevent water from water and keep their eyes dry.When buying, you can check the sealing performance and waterproof design of the goggles to ensure its effective waterproof.

3. Leeper type

According to personal needs and preferences, choose suitable lens types.Common electroplated swimming lens types include ordinary lenses, myopia lenses and anti -fog lenses.

4. UV protection

Choosing a Swimming goggles with UV protection function can effectively block the damage of ultraviolet rays to the eyes.Generally, electroplating goggles have the function of anti -ultraviolet prevention.

5. Material and durability

High -quality electroplating goggles are usually made of durable materials, such as silicone or rubber, which has a long service life.Check the material and structure of the swimming moster to ensure that they are firm, soft and comfortable.

6. Anti -fog performance

Anti -fog performance is also a factor that needs to be considered when choosing a plating goggles.Although the anti -fog effect may weaken over time, choosing a Swimming goggles with anti -fog function can reduce the problem in this area.

7. brand and model

It is best to try swimming moster before buying to ensure its comfort and adaptability.If possible, consult a professional sales staff or swimming coach to recommend suitable swimming mirror brands and models according to your needs and Levels.

8. Vision

Different Swimming goggles may provide different vision range.When choosing a swimming mirror, you can choose the appropriate field of vision according to your needs and preferences.Generally speaking, a wider field of vision provides a better viewing experience.

How to choose the electroplating goggles

1. Comfortability

The comfort of the electroplating goggles is very important, especially when swimming for a long time.Before buying a swimming moster, try to wear several different models and brands to find the most in line with your needs.

2. Sealing

When choosing an electroplating goggles, observe whether the rubber of the swimming mirror frame is soft and sealing. The inspection method is to embed the swimmers on the eyes when not taking the lead.Fall in good sealing.

3. Anti -fog

The anti -fog is to prevent the fog in the water vapor in the Swimming goggles, which is attached to the lens to block the sight.When choosing, pay attention to whether the anti -fog performance of the electroplating goggles is good.

4. color

There are many color plating goggles on the market now. The color of the Swimming goggles is different, which will affect the light of the object, so it is also important to choose the color of the swimming moster that suits you.

5. Frame size

There are small frames and large frames in electroplating goggles. No matter which type, there will be deep or shallow indentations after we wear it for a long time.The sealing of the small frame of the swimming mirror will be relatively better, but it will press the organs for a long time.The large frame is basically integrated wrapped, which fits the brain, the side of the eyes, and the bridge of the nose, and the comfort will be better.

6. myopia Ding Goggle

If you are myopia, the degree of myopia goggles is 50-100 degrees lower than myopia.To put it simply, you have 500 degrees of glasses you wear, and the myopia swimming mirror is 400-450.

7. myopia astigmatism goggles

If your myopia astigmatism, the degree of mirrors of myopia, half of the number of myopia (50-100 degrees).The degree of myopia is 500, the astigmatism is 100, and the number of myopia goggles can be selected 500 or 450 myopia goggles.