one,fishingWhat are the types of

There are many Fishing gear for fishing. One of the Fish drifting is a kind of action for catching fish to eat bait on the bottom of the water. There are many types of Fish drifting fishing. The common main types are:

1. vertical drift

The vertical drift is the most used Fish drift used by the fishermen. The advantage is that the stability is good, the sensitivity is high, and the usage is flexible. The disadvantage is that the drift is more complicated, and it has certain requirements for the depth of the fishing point.

2. Seven Star Drifting

Qixing drifting is the most commonly used Fish drift in traditional fishing. It is also known as ravioli and star drift. It is named after seven relatively independent drift Beans, especially suitable for shallow water and grass caves.

3. Circular drift

The horizontal drift is an oval -shaped Fish drift. It is lying on the water when used. It can be slanted or stand upright when eating bait. The biggest feature of this Fish drift is not afraid of the wind and waves.

4, spherical drift

There are two types of spherical drifts: round and jujube -shaped. They are mostly used for fishing (sea rods, rods, etc.) fishing, especially when floating fishing catfish and catfish are the most commonly used, which is characterized by large buoyancy.

two,How to choose Fish drift

1. Look at the amount of lead

This is an important indicator for choosing Fish drift. You can choose the suitable lead -eating Fish drift according to the season and water depth. It is like a fish with a large body in high temperature summer, so you should choose a Fish drifting with a larger lead.In addition, if the water depth or fishing rod is long, you should also choose to eat a large amount of lead, and vice versa.

2. Look at the material

Common materials for Fish drift are reed drift, nano -Fish drift, etc., such as nano -Fish drift cost -effective, and small interference by the outside world, so it is very popular. The reed floating has a large amount of lead, high sensitivity, and suitable for fishing fish, but the price is slightly expensive.

3. Look at the drift type

The Fish drift types are roughly long, short, and urgent shoulders. On the feet and tails, there are various types due to the differences between length and shortness. The applicability of different drift types is also different. Here are three types of introduction.

Long -body drift: This type of drifting type is small in water, the bottom is fast, and the stability is good, so it is suitable for use in deep water and suitable for fishing.

Short drift: The opposite is just the opposite of the long body. The short body drifting is not stable enough, but the drifting speed is fast, the sensitivity is good, suitable for floating fishing, fishing for some small fish.

Drifting body: This is more suitable for wild fishing, can fish for the bottom, and can fish deep water. Because the signal of eating long -term fish is very sensitive, it is best to combine with long fish line fishing.

4. Look at the drift tail

Fish drifting tail is related to the sensitivity problem. The thinner the tail, the higher the sensitivity. For example, when you want to catch catfish in winter, you can choose the long body drift in the fine tail, because the long body drift is suitable for fishing fish, and the fine tail tails can be used, and the fine tail tails can be used, and the fine tail tails can be used, and the fine tail tails can be used.It can make up for the shortcomings that are not sensitive enough.

three,What materials are better in Fish drift?

1,Peacock feather material

The production of peacock feather Fish drift is more complicated, and the Fish drift is not resistant to rough (that is, it is not damaged). After removing the shell, the quality and process requirements are high.It is particularly heavy without feather Skin, reducing the floating power.Suitable fish groups: black pits, small fish, small miscellaneous fish, peacock feather Fish drifting its fishing stability, low sensitivity, and easy to eat water.

Disadvantages: Due to material reasons, peacock feather Fish drifting is easily affected by the external temperature and water quality, causing Fish drift to change the phenomenon. In the pastRunning fish and catching fish are unstable, resulting in less use.

2. Balshan wood material

High sensitivity, strong stability, and turning quickly in the water.Bals ceshan Fish drift production process is very simple. Machinery lathe can be made formed, and many fishermen can also make themselves at home.Fish drifting has a long life, a lot of shapes that can be made, Fish drift is very simple to make, low price is very suitable for fishermen who are first fishing fishing.

Features: The biggest feature of Balshan wood Fish drifting is that the stability is better, it is easier to tune, and it is not easy to be affected by the mild fishing and fishing weather.

3. Fish drifting of reed materials

The reeds are made of Fish drifting, which is very suitable for some senior black pits to steal donkeys. Fishermen fishing for black pits and old slippery fish and light fish fishing, but it is not recommended to use it if it is a newcomer of fishing.

Features: Reed Fish drifting not only has the characteristics of lightness, high lead buoyancy, high sensitivity, and the production process is relatively simple.

Disadvantages: Because of its characteristics, it also makes the export signal of the reed Fish drifting very chaotic. Even the slight movement or water flow in the water in the water may cause the reeds to float or dark, causing too much fake action.

4. Nano -material

Nano -made Fish drift has only appeared in the past two years, but it has developed very rapidly. From the time they saw it on the market, a fish starts at more than 100 yuan.So much of the current yuan can be bought. The price of the price is very large, which is directly related to the development of its process, because nano -floating is processed by pure machines.Stablize.This is not comparable to manual.The nano -made Fish drift represents the industrial development of Fish drifting.

Disadvantages: Nano is a synthetic foam, which is more suitable for fish drifts that make the nucleus -shaped jujube -shaped shape. The long -body shape is easy to break due to material reasons. The disadvantage is that the sensitivity is very low.fish.

Advantages: Nano -material Fish drifting does not eat water. It is not too high for paint production and other processes. It is a little scarred, the surface and depth of the Fish drift are slightly scarred, which does not affect fishing.

Four,Fish driftWhat color is clear

The orange -yellow fish drifts the clearest in the water. The color of Fish drifting is very large, and there are many opportunities to choose from. Each color has its own characteristics.The use of orange -yellow Fish drifting is the highest in several colors, but one of his disadvantages is that it is easy to fade if it is frequently used.

The color of the Fish drifting is very rich, with both red and green, red and yellow, and orange and yellow. Each color has its own characteristics. If you fish, you can choose your favorite color, or you can follow the environment around the fishing point., Choose a more eye -catching color.

1. What clothes do you wear when playing BadmintonIntersection

1. Clothing selection should be fit and loose

The motion of Badminton is large, which requires the clothing (usually short -sleeved sweatshirts and sports shorts) during Badminton.Loose, otherwise it will cause obstacles to action.

2. Material choice

In terms of sportswear materials, especially in the material of short -sleeved sweatshirts, try to choose the material of sweat absorption and humidity, instead of choosing cotton -made clothing, because the cotton material has a strong sweat -absorbing sweat, but it does not discharge wetting.Stick wet on your body, very uncomfortable.At present, most Badminton brands are provided with Badminton sweaters contain moisture -absorbing and sweating materials.

3. Sport pants selection

The material of sports shorts is not as particular as a sweatshirt, but it also has certain characteristics.At present, the shorts of elastic materials are more popular. This does not seem too loose, and it will not be comfortable with the athletes' great steps, which is very ideal.The previous shorts, either a single -layer cotton, must be very wide to ensure that the movement of the big step is not restrained.Either it is added with lining. This designed shorts ensure the strength of the shorts, but there is a high chance that it will affect the amplitude of the leg movement.Essence

two,How to choose a Badminton suit?

1Clothing selection

(1) Breathable

The Badminton's sport is relatively intense. After a period of time, the body will exclude a lot of sweat, so you must choose the clothes that can be sweaty when playing Badminton.Generally, people who have long insisted on playing Badminton can choose professional Badminton uniforms, and they have special sweat techniques.If you do nt wear professional clothing, you can choose light clothes, but be careful not to wear cotton clothes. Although cotton clothes will absorb sweat, they are not volatile, which will cause the clothes to stick to the body.Convenient to play.When playing Badminton, you need to exercise the whole body, so the clothes you wear must be thin. If it is too heavy, it will cause it to stretch when playing, and it is not conducive to sweat excretion.

(2) Leisure style

The sport of the motion of Badminton is relatively large, so the clothes you wear must be convenient to exercise, not too tight, otherwise it will restrain the body and affect the body's stretching, and it is easy to make mistakes when playing.Therefore, the choice of pants should choose elastic clothes that do not affect the pace. It is best to choose shorts. shorts will not hinder leg movement.

(3) No tight

Do not wear tight clothes when playing Badminton. Wearing tight clothes will not only affect the play when playing, but also affect the sweat system of the body.Wearing a tight body can cause the blood circulation system to be hindered, the blood circulation of the waist and legs is not Smooth, it can easily cause various diseases, and cause symptoms such as dizziness and nausea, so it is best not to wear tights.

2shoes selection

(1) Don't wear running shoes

It is normal if you think that it is normal to wear a Running shoe to play Badminton. This kind of understanding is wrong.First of all, we must realize that the two kinds of sport, which are Running and playing Badminton, are also very different for sports shoes, and there are essential differences.Do some ball movements such as Badminton, because both feet often need to move quickly during exercise.The ankle needs to be strengthened to achieve this. The performance of running shoes is designed for the sport of Running. For ball movements, it does not have a universal effect.

(2) sneakers selection

The selected badminton shoes should be light, it is best to choose a professional badminton shoes.The soles are wear -resistant and non -slip.The bottom of the badminton shoes should be raw or beef tendon texture.The soles of the shoe have shock absorption and buffer.Do not wear basketball shoes, jogging shoes or canvas shoes.The canvas shoes are the upper of the rubber. In the course of continuous jumping and landing when playing, the soles cannot have the cushioning effect, which is easily damaged.

threeprecautions for playing Badminton

(1) Pay attention to shoes

No matter what kind of shoes, as long as you close your feet is the key.Your feet will increase when under pressure and aerobic exercise.The heat generated by severe exercise will increase the foot half of the size.At the same time, you should not squeeze your feet when buying shoes. There should be a gap between the thumb nails between the roof and your longest toe to ensure that your toes can be free.The activity should be appropriately followed.In addition, the length of the foot should be measured frequently, because age growth and damage may change the size of the foot.

(2) Pay attention to warm -up

Before playing Badminton, you should do a good job of warm -up exercise. The muscles without exercise are easy to sprain, because it is not fully prepared to withstand the sudden big movement.Any warm -up action can improve muscle adaptability and make the joint flexible.The warm -up before exercise is conducive to the cardiovascular system of the athlete and health.

(2) Playing attention

Actions must be standardized and standards, don't think that you don't take it anymore yet.For the time being, regardless of the rising space of your technology, the movement is irregular, as long as it is regularly played for a long time, injury is inevitable.The process of injury may be slow, but sooner or later, it will come.In addition, after exercise, pay attention to relax your body muscles, so as to avoid muscle tightness and muscle soreness.

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1. Do you have to wear a helmet on a bicycle?

The answer is yes, you must wear a helmet when riding a bicycle.This is not only responsible for your own life security, but also responsible for the safety of others.Let's explain in detail why you need to wear a helmet for a bicycle.

First of all, the helmet is the first line of defense of the bicycle cyclist.During the cycling process, if an accident occurs, the helmet can effectively protect the head and reduce the risk of head injury.According to research, head injuries are one of the main causes of the death of a bicycle accident.The helmet can absorb the impact and reduce the damage of the impact force on the head, thereby greatly reducing the risk of death and serious injuries.

Secondly, the helmet can reduce the occurrence of cerebral vibration.Brain vibration is a common trauma of brain, which may lead to long -term health problems and even affect the quality of life.The helmet can effectively protect the head and reduce the occurrence of brain vibration.

Furthermore, the helmet can also prevent faces and eyes from being injured.In a bicycle accident, faces and eyes are the most vulnerable parts.The Bicycle helmet can cover these parts to prevent them from being hit directly.

However, although the importance of a helmet is self -evident, in actual life, many people do not develop the habit of riding a bicycle and wearing helmets.Some people think that the speed of bicycles is slow, and there will be no big things; some people feel that the helmet is uncomfortable and unwilling to wear it; others are because they are troublesome or worried that the helmet will stain their hair and don't want to wear it.

These concepts are wrong.Although the bicycle is slow, once an accident occurs, due to the effect of human inertia, the power of falling is very large, which can easily cause serious damage.Moreover, the comfort of the helmet can be improved by selecting the appropriate model and adjusting the method of wearing.As for worrying that the helmet will soil the hair, you can choose a helmet that is breathable and easy to clean.

In addition, we need to know that the choice and use of helmets are also a science.First of all, the size of the helmet should be appropriate, not too large or too small; second, the buckle band of the helmet must be firmly fixed on the head; in the end, the validity period of the helmet is generally 3-5 years. After the expiration, a new helmet needs to be replaced.Essence

2. Can't check the helmet for a bicycle

At present, there is no clear traffic regulations in my country that riding a bicycle must wear helmets.However, this does not mean that wearing a helmet when riding a bicycle is not important.

In fact, the public security traffic police department has always suggested to wear helmets while riding a bicycle.Although most cities are forced to wear helmets for people riding electric cars, riding bicycles also have certain risks.When an accident occurs, the helmet can effectively protect the head from serious damage.

In recent years, in order to improve the safety awareness of citizens and ensure the safety of the people, the Ministry of Public security has increased its efforts in terms of traffic management.Especially for people who ride motorcycles and electric bicycles, they strictly check whether they wear safe helmets that meet standards.

Although cycling has not been forced to wear helmets, it is still necessary for those who have long bicycles or often travel to bicycles.Because once a traffic accident occurs, the head is often one of the parts that are most likely to be severely damaged.

In short, although there is no compulsory request for traffic regulations to ride a bicycle to wear helmets, for their own safety reasons, it is recommended that the majority of citizens wear helmets while riding a bicycle.

What is the use of sports guard

1. Fix the hair to prevent the hair from covering the eyes and make the field more open.

2. Have a good sweat absorption function.During the severe exercise, the head sweats a lot, and the temperature and the outside temperature are greater. Wearing a sun hat will feel sullen, so the headband becomes the best choice.

3, In the football game, because the athletes will often jump and fight, the wider headband is easy to slip and cover the eyes during the struggle, sofootball The athlete's headband will be thinner.

4, Athletes wear headbands the most common in the NBA game.It can be said that leading the leadership has become a culture of NBA black players.In addition to sweating, black players have a high hairline. After wearing it, it is indeed conducive to improving the "face value" of the players.

How to move the sports headband

1. Stretch the prepared headband to a maximum arc and then put it into your neck.

2. After sorting out your short hair, you slowly move your hair to your forehead, and adjust to your most comfortable and most suitable face position.

Note: To ensure that the hair on the top can be fluffy and upright. If the top hair collapses due to the head strap, then adjust it correctly.If you buy a wide -headed strap, you can consider putting your ears inside. If you are narrow headband, it is better to expose your ears.

In fact, the position of the sports headband is actually adjusted with the length of the hair.If you are a short hair style without bangs, you can choose to bring your head back to move some, so as to make the overall feel more godly and energetic; but if you have a short hair style of bangs, you can choose to bring it in the bangs.The forehead at a slightly lower forehead is full of fashionable charm, which adds a hint of tide at the same time as exercise.

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How far can the Telescope look at

1. The distance between the Telescope is related to human vision.For example, the letter on the vision table: When "E" is 5 meters away, people with good vision can see the bottom line. People with myopia may only see the previous lines of "E".If you put the vision to 50 meters away, with a 10 -fold Telescope, it is equivalent to 10 times (the same as 5 meters away).People with good vision can still see the bottom line. People with myopia still can only see the big "E" in the front, and the bottom is still unclear.People with myopia will say that this Telescope can't see 50 meters, and even the bottom letters cannot be seen clearly, and people with good vision will say that this Telescope is very good. Even the bottom of the vision table at the bottom of 50 meters is still clearly seen.EssenceCan you say that this Telescope can only watch 50 meters?

2. The distance between the Telescope is related to the size of the object.For example: there is an ant at 1000 meters. You use 10 times the Telescope, which is equivalent to looking at the ants near 100 meters. You must not see it.Can you say that this Telescope can't see 1,000 meters?If you are a personal at 1000 meters, you use a 10 -fold Telescope, which is equivalent to pulling people closer to 100 meters. You must see it clearly.With a Telescope, you can clearly see the mountains of the moon at 380,000 kilometers, but you can't see the earth satellite that is much more than us. This is the truth.

3. The distance of the Telescope is related to the quality of the air.For example, using the same Telescope, the same person observes a billboard at 1,000 meters.After the rain, in the sunny weather, you can clearly see the small words on the billboard.In the case of no sun and air in the cloudy days, there are cars and dust in the air, it may not be clear.Furthermore, if there is a fog, that is, there are a lot of suspended particles in the air, and the visibility is reduced. You may not even see 5 meters.This is why the heavy fog weather blocks the highway.

4. The distance of the Telescope is related to the quality of the Telescope itself.Two parameters of the two Telescope (multiple, diameter, field of view, pupil distance, pupil diameter), Telescope with exactly the same size, the price may be several times or even more, there is nothing weird.The price and multiple of the Telescope have little to do, and the military Telescope has almost no more than 10 times.The lens, prism, coating, and structural parts of the Telescope determine the quality of the Telescope.A good Telescope light transmission can reach more than 90%, and the poor Telescope is only 50%-60%. The poor Telescope watching the sky is obviously dark.

You should understand why the Telescope does not see this data?As long as there are unlimited objects, the Telescope can see infinite far.With hundreds of light -year planets, we can see it without a Telescope, and we can also see with a Telescope.The moon is far away from us (380,000 kilometers), and we can see it with a Telescope.But no matter how good you are using a good Telescope or a close distance, you can't see it. Why?Because they are too small!

Basic principle of Telescope

The Telescope is an optical instrument used to observe long -distance objects. It can amplify a small horns with a small corner at a certain magnification, so that it has a large corner in the like space, so that the naked eye cannot be seen or could not see or can be seen or could not see it.The distinguished object becomes clear and distinguished.Therefore, Telescope is an indispensable Tool in astronomical and ground observations.It is an optical system that keeps the incident parallel light beam through objectives and eyepiece.It is generally divided into three types.

1. Introduction and principle of refraction Telescope

The refraction Telescope is a Telescope with a lens camera mirror.It is divided into two types: Galileo Telescope with melter mirror as a eyepiece mirror.The birch mirror is called the Capeler Telescope.

Galileo Telescope is a mirror that is a convex lens and a eyepiece is a concave mirror Telescope.The real image of the light through the refraction of the objective mirror is on the focus of the eyepiece (behind the purpose of the person). This is like a virtual image of the pair mirror, so it is refracted into a magnifying positive image.The magnitude of the Galileo Telescope is equal to the ratio of the focal length of the material mirror to the focal length of the eyed mirror.Its advantage is that the lens barrel can be short and can be positive, but its vision is relatively small.Two Gali Lue Telescopes with a low magnification of the magnification are tied together. In the middle, a bolts can be used to adjust their clear degrees at the same time, called "Drama mirror".Because it is easy to carry, it is often used to watch performances.The Telescope invented by Galileo has an important position in the history of human understanding of nature.Its advantage is that the structure is simple and can be directly in the right image.

The Capeler Telescope is composed of two convex lenses.Because there is a real image between the two, which can be convenient to install the branch board and excellent performance, professional -grade Telescopes such as military Telescopes and small astronomical Telescope are currently adopted.But this constitutional imaging is inverted, so it is necessary to add a positive system in the middle.

There are two types of systems: the prism is like the system and the lens are like the system.Our common front -wide and narrow typical binocular Telescope uses the two right -angle prisms.The advantage of this system is that the optical shaft is folded twice at the same time as positively, which greatly reduces the volume and weight of the Telescope.The lens is like a set of complex lenses as the system.

Due to the color difference between the mirror mirror and the ball difference, the modern refraction Telescope often uses two or more lens group crop mirrors.Among them, dual lens mirrors should be most commonly used.It is composed of convex lens made of a crown glass that is close to each other and a concave lens made of a piece of fire stone glass. It can completely eliminate the color difference between the two specific wavelengths, and the color difference of the remaining wavelength can also be weakened accordingly, as shown in Figure 2 in Figure 2Show.

When meeting certain design conditions, the gap and comets can be eliminated.Due to the effects of the remaining color difference and other aberrations, the relative caliber of dual lens mirrors is small, generally 1/15-1/20, rarely greater than 1/7, and the field of view is not large.Dual lens mirrors with a diameter of less than 8 cm can combine two lens glory together, called double glue compound mirrors, and there is a dual -separated mirror with a certain gap without glue.

In order to increase the relative caliber and field, multiple lens mirror groups can be used.For the Galileo Telescope, the structure is very simple and the light can lose less.The lens barrel is short and light.And it is positive, but the multiples are narrow, which is generally used for drama mirrors and toy Telescopes.For the Campler Telescope, you need to add a prism or a lens group to the image behind the object mirror to make the eyes observe the positive image.The general refraction Telescope uses the Capeler structure.

Because the imaging quality of the refraction Telescope is better than the reflected Telescope, the field of view is large, it is convenient to use, and it is easy to maintain. Small and medium -sized astronomical Telescopes and many special equipment are mostly refracted systems, but large refractive Telescopes are much more difficult to make than reflecting Telescopes because the smelting is large, because the smelting is large.The high -quality lens of the caliber is very difficult, and there is a problem with the absorption of light in the glass, so the large -diameter Telescope uses reflex.

2. Introduction and principle of reflection Telescope

The reflector Telescope is a Telescope with a concave reflector.It can be divided into several types such as Newton Telescope Kedar Telescope.

The principle of Newton's Telescope is to reflect the light on a focus using a curved mirror.This design method is several times higher than the magnification of the object to enlarge the object.It uses a parabolic mirror as the main mirror, enters the bottom of the lens barrel, and then folds back to the second reflector (diagonal reflex mirror of the plane), and once again changes the direction into the eye mirror focus plane.In order to observe, the eyepiece is placed near the side of the top of the Telescope lens barrel, as shown in Figure 3.Newton's reflection Telescope replaces the expensive and bulky lens collection and focusing on the light, thereby reducing the cost.

Newton's reflected Telescope system has a focal length of up to 1000mm and is still relatively compact and portable.Because the main mirror is exposed to air and dust, the Newton's reflectors Telescope requires more maintenance and maintenance.However, this small disadvantage does not hinder the popularization of this type of Telescope. For those users who want a price economy, they can still solve the weak observation and distant targets, Newton's reflecting Telescope is an ideal choice.Due to the principle of optical systems, the imaging of Newton's Telescope is an inverted image, which does not affect astronomical observations. Therefore, Newton's reflection Telescope is the best choice for astronomy.Through an additional lens such as the mirror, the image can be corrected, but the image quality will be reduced.

The Carse Green Telescope has a main mirror of the parabolic mirror, and the dual -curved secondary mirror reflects the light and passes through the hole in the center of the main mirror.In the lens of the small Telescope and camera, the secondary mirror is usually installed on the optical platform on the transparent optical glass board with a closed Telescope lens barrel.Such a device can eliminate the "star" scattering effect caused by the spider -type supporting frame.Although the closed lens cylinder will cause losses in the amount of light, the lens barrel can be kept clean and the main mirror can be protected.

It uses some characteristics of bilateral and parabolic reflection. The concave parabolic reflection mirror can converge all light in the light shaft into a single point -focus.The bilateral reflector on the convex surface has two focal points, which will reflect all light through one of the focus to the other focus.The lens of this type of Telescope will be placed in the design of sharing a focus in design so that the light can be used in another focus of the bilateral mirror for observation. Usually external eyepiece will also be at this point.The main mirror of the parabolic surface will enter the parallel light reflection of the Telescope and converge on the focus. This point is also a focus of the bilateral mirror.Then the dual -curved mirror reflects these light to another focus to observe the image there.

The main advantage of reflecting Telescope is that there is no color difference. When the object mirror is used, the ball difference can be eliminated.However, in order to reduce the effects of other aberrations, the field of view can be smaller.The materials that manufacture reflectors only require small expansion coefficients, small stress and easy grinding.The grinding reflectors are generally plated with an aluminum film on the surface, and the reflectivity of the aluminum film in the range of 2000-9000 Elaboratory is greater than 80%. Therefore, in addition to the optical band, the reflected Telescope is also suitable for the near-infrared and near-ultraviolet wave bands.research.The relative caliber of the reflective Telescope can be made large. The relative caliber of the main focus reflecting Telescope is about 1/5-1/2.5, or even more.There are only one surface of the main mirror that requires processing, which greatly reduces the difficulty of cost and manufacturing. Therefore, the current optical Telescope with a caliber greater than 1.34 meters is all reflecting Telescopes.A large -caliber reflecting Telescope can obtain the focus system (or Newton system), Kaserglin system, and folding system by changing different sub -mirrors.In this way, a Telescope can get several different relative caliber and field.Reflecting Telescope is mainly used for celestial physics.

3. Introduction and principle of reflecting Telescope

This kind of Telescope is based on the spherical reflex mirror, and then adds a refractive element for correctional imaging, which can avoid difficulty in large informal processing and get good quality quality.The more famous is Schmid Telescope, as shown in Figure 5.It places a Schmidt formal plate at the center of the ball reflector.It is one surface of the plane, and the other side is a mild deformation of the non -spherical, which makes the center part of the beam slightly converge, and the peripheral part is slightly divergent, just to correct the ball difference and comet difference.

The optical system of the Mark Subetov Telescope is composed of a concave spherical reflex mirror and a lens that corrected the ball difference in front, as shown in Figure 6.Correction of the lens is the sphere. The curvature radius of the two surfaces is not much different, but it has considerable curvature and thickness.Therefore, this system is sometimes called a moon mirror system.Properly select the curvature radius and thickness of the two sides of the lens, which can make the bending lens generate enough to compensate for the ball difference between the concave pads mirror, and at the same time meet the color elimination conditions.In the entire system, the distance between the bending moon lens and the spherical mirror can be corrected.The statue of the Macsolov long mirror optical system is very small, but the venue is relatively large, so it must use curved negatives that match the focus surface.The central part of the second side of the bending moon lens can be grinded into a spherical side with a longer curvature radius (it can also be a lens with a glue combined, which constitutes the Mark Subetov Kasselin system with relative caliber.Part of the central mirror part of the central mirror forms a Masukov-Carseglin system.

In addition to Schmidt Telescope and Mark Subov Telescope, there are two derivatives of these two Telescopes, such as Super Schmidt Telescope, Beck -Nuen camera, etc.In the refractive Telescope, the reflex mirror is used, and the refractive mirror is used for correctional image difference.It is characterized by a large caliber (or even greater than 1), strong light power, broad vision, and excellent quality.Suitable for celestial photography and observation of celebrities, comets, meteors and other celestial bodies.If a small eyes look at the reflected Katgreen system, the lens barrel can be very short.