one,How to buy a applicable binocular Telescope

Three directions of the consideration of the two -Tube Telescope without external diameter, magnification, and lens quality:

CaliberTheThe size (diameter or caliber) of the objective mirror (lens in front of the Telescope), The double -Tube Telescope on the market is used to use it20mmto70mmThe diameter is more common, such as the label on the Telescope12 x25Of25The representative diameter is25mm(2, 5Cm.,,12It represents its magnification, the larger the caliber, the larger the volume, and the light power of the caliber and the Telescope(Brightness) Calling portrait (clarity)There is a great relationship,12 x 25and12x50Two dual -microscopy is also the same12DoubleBut the latter's brightness and sharpness must be higher than the former.

When you consider the diameter of the dual -Tube Telescope, there are nothing more than two options:

1. If you are ornamental concerts, various ball competitions, mountain climbing, outing travel, etc. to facilitate the use of priority, it is best to choose small and medium -caliber (35mmthe following) The model, the size of the size is also light, but it is inevitable that the brightness and resolution will be sacrificed.

2. If it is astronomical observation, night or long -distance observation, etc. with high brightness and high -solution image as the first priority, choosing a larger caliber will be ideal.Most of the binocular Telescope already has a tripod fixed -hole design, which can be fixed on the average camera tripod. It can not only reduce the burden on both hands, but also greatly improve the stability.

High and lowTheGenerally, consumers mostly consider the multiplier when choosing a Telescope. The higher the ratio, the better. In fact, it is not correct. The high rate does not represent the clearer image and the caliber is larger.The biggest advantage of the Telescope is that it is easy to carry and has high maneuverability. If the long -distance observation requires a higher power rate, it is recommended to choose a single -Tube Telescope effect.

lens qualityTheThis item can be considered the most difficult to understand in the average person. A two -Tube Telescope optical part is:1. object mirror.2. Eye mirror.3. Prism.Combined, let's talk about it first:

1. object mirror:That is, the lens closest to the target of the two -set lens barrel at the front of the two sets of goggles. The image is directly related to the quality of the objective mirror. Generally, most of the products are combined with two lenses.The Telescope uses three combinations, or uses itED, Fluorite and other special material lenses to reduce the effects of color differences.

2. Eye mirror: When using a Telescope, the lens group near the eyes is called the eyepiece (left and right eyes), Typical eyepiece is composed of three optical lenses. The vision of the eyepiece itself is about50Around the degree, the actual field of vision is to divide the eye mirror vision. If the same multiplier twin Telescope mirror, if you want to have a large field of vision, and maintain a good image around the field of vision, you need more lenses, more complex design to correctThe price is relatively improved.

3. Prism:If there is only a combination of objective mirrors and eyepiece, the imaging of you see is reversed, so a set of positive prisms need to be added on the light path between the objective mirror and the eyepiece.In the normal direction, the material of prism is generallybak-7glass, higher -level models will choose high refractive indexesbak-4The prism makes the image brighter.The two -Tube Telescope design must be used with a roof spine prism(ROOF PRISM), the production is more difficult, and the price is usually relatively high.

The above optical common sense, I believe it will help, the last three principles for your reference when you choose:

First, when you consider carrying convenient carriers and choose small models, the multiplier rate should not be too high, otherwise you may be disappointed because the brightness is too low.

2. You must understand what the purpose of using a Telescope?It is the best choice of one that suits you need.

3. Find a professional company to tell your purpose and budget in detail. I believe that as long as you are a professional company, you will definitely give you a satisfactory service.

Second, the tips for buying a bilateral Telescope

1. Trip tips for buying a long -range optical effect

Generally, when we buy a Telescope, we will see the same specifications of the Telescope. The price is very different. This is mainly because the lens of our Telescope is different because it affects the quality of the Telescope optics.The brightness of the general Telescope is the highest, and the brighter it means that it can see further.

The better the lens coating, the more transparent the lens, the darker the reflective.There is also a red film Telescope. The red film of the lens not only increases the brightness of the Telescope, but also makes the imaging more similar. Everyone can also choose this type of Telescope.

2Functional purchaseTips

The internal nitrogen of the Telescope has a water effect, and it can also prevent the fog of the internal lenses and the mold. This is mainly because the Telescope is seal, so this increases the durability of the Telescope.Talk about the advantages and disadvantages of different prisms of the Telescope, generally there arePorroPrism and prismroofPrism.PorroAlthough the prism is large, the structure is simple, the light transmission rate is high, and the imaging quality is good.androofThe prism, although the volume is small, but the structure of the prism is complicated and the light transmission rate is low.

3. Buy a Telescope workmanship and materialTips

1. 1.It is made all plastic.

2.It is mixed with plastic and metal, and its main parts are made of metal materials.

3..It is made of all -metal. This is the best durability of the Telescope in the three materials.

1. Is the surfing board inflatable?

The surfing board does not need to be inflated.

The surfing plate is solid, and there are many manufacturing materials. Generally, it is made of tape with large buoyancy. The shape is rectangular in the front circle. The surface is Smooth and there are some raised in front. It cannot be inflated inside.

Water inflatable is floating bed or air cushion boat.

2. Where does the motivation of the surfing board come from

Speaking of surfing, friends who like the maritime project should like this. In the past, traditional surfing equipment relied on the wavy of sea water. However, with the development of technology, electric Surfboards have become emerging equipment.The biggest feature of this electric surfboard is that it can achieve the purpose of surfing through its own electric device without waves.

The power source of the electric surfboard is an Underwater propeller, and the rotation of the propeller is driven by a built -in lithium batteryIt can provide about 1 hour of kinetic energy. In addition to entertainment, this surfingboard also has the "rescue mode". Although it is strange and cool to use, the price really makes many people be expected to be inaccurate.It is reported that the retail price of such a surfboard is $ 5,000.

Although this kind of electric surfboard looks simple, it is very difficult to operate. For beginners, this surfingboard is not suitable. It is still practicing with traditional Surfboards. After mastering a certain skill, challenge the challenge.This cool water "Royal Sword Flying".

1. Can Ice silk Sunscreen mask really prevent ultraviolet rays?

In summer, hot ultraviolet rays are strong. Many people choose Sunscreen masks of ice silk. So can Ice Sunscreen masks really prevent ultraviolet rays?

The outer layer of the ice Sunscreen mask is made of special UV fabrics. It has good anti -ultraviolet reflection and absorption capacity, which can reflect and absorb ultraviolet rays.The ice Sunscreen mask can eliminate the damage to the human body to a certain extent. Correctly wearing Sunscreen masks can reduce Skin stimulation caused by ultraviolet rays.At the same time, there are many traditional Sunscreen masks without the advantages of the ice Sunscreen mask, that is, adding ice -sensitive factor, so that the mask is not sultry when used in hot summer.

2. Is the ice Sunscreen mask be disposable?

I have briefly learned that the ice silk Sunscreen mask can prevent ultraviolet rays. Then let's understand that the ice silk Sunscreen mask is one -time?

Because the ice silk mask is made of air cotton, non -sponge material, the mask has no odor, can be used repeatedly, so it is not one -time.

What is the fabric of ice silk

The ice silk fabric is the name of the chemical fiber, and the ice silk is also called artificial silk, sticky fiber, sticky glue, etc. It is precisely a variants of polylastic glue fiber.The hygroscopic and breathability of this fiber is better than that of ordinary adhesive fibers, and it also has better preservation and Hanging.

Most of the ice silk on the market is a collective name for ice silk, and the ingredients contain are not the same.For example: a collective name of polyester fiber, sticky fiber, polyester, spandex, nyd, Modal, cotton hybridization, etc.Ice silk is not a material.It is a collective name of one or more materials.Generally, it mainly refers to elastic fibers.Contains but not limited to: artificial material, natural material and other ingredients.

1. Where is the difference between the canvas Hammock and the parachute cloth suspension

There are many hammocks, such as canvas, mesh, 210T polyester spinning (commonly known as parachute cloth), etc. are more common. Among them, the canvas hammocks and parachute cloth hammocks are often brought up. So what is the difference between them?

1. The parachute cloth Hammock is lighter than the canvas suspender, but the load -bearing ability is stronger.

2. Because the parachute cloth Hammock is relatively light, it is more convenient to store than canvas.

3. The parachute cloth suspension is easier to clean than the canvas Hammock, and the canvas suspender requires more cleaning and maintenance.

4. In terms of style, there are more colors and patterns to choose from.

5. Products of the same brand, parachute cloth hammocks are generally more expensive than canvas suspenders.

2. Which canvas Hammock and parachute Hammock is comfortable

The suspension machine is used outdoors, and its comfort is more important. Compared with the canvas Hammock and parachute Hammock, which is more comfortable?

In terms of comfort, the canvas material is softer and more comfortable than the parachute cloth material, better breathability, and often more comfortable to use. The advantages of parachute cloth suspension are mainly light, fast, easy to clean, and durable.

3. Which of the parachute cloth suspension and canvas suspenders is stronger?

In addition to comfort, the strong level of the Hammock is also valued. Which one is more strong and depends on the DEN value of the parachute cloth suspension and canvas Hammock.Essence

1. Introduction to Diving clothes

Subtaking, its main role is to maintain the body temperature of the divers and prevent accidental damage (because some jellyfish and corals are toxic).You can also show sunburn.Subtaking can be divided into dry diving and wet Diving clothes.As the name suggests, the dry type is waterproof, mainly in the cold zone.Wet type is not waterproof, but it can also keep the body temperature difficult to disperse.

2. How to choose Diving clothes correctly

1. Selection of the thickness of Diving clothes

Diving environment independent variables, Diving clothes for variables.Starting from the functions and functions of Diving clothes, because the main role of submersible is to keep warm, the thickness of the submersible is determined by the water temperature of the sea area.Generally speaking, the thickness of about 0.5mm-3mm is warm in the waters.The cool water temperature requires 5mm or more wet Diving clothes; the style selection is also determined by the diving environment, such as water temperature, marine biological types, etc. Generally speaking, there are three types of jellyfish, wet diving and dry Diving clothes.

2. Choose the right size

The technique of diving clothing is important to try on the size.After checking whether there are still some space after putting it on, if you can wear another piece of clothes, if this happens, you will not be able to keep warm;Too short trousers indicate that the Diving clothes are too small.

3. Diving fabric selection

Substitute purchase prompts, fabric selection is very important. Neoprene is commonly known as diving materials.Generally speaking, it is a synthetic rubber foam. It feels delicate, soft, and elastic, and has the characteristics of shockproof, insulation, elasticity, impermented, and impermented.Good weather resistance, oxygen resistance, self -extinguishing, good oil resistance, stretching strength, elongation rate, and excellent elasticity.

4. Diving clothes style selection

Site (tights) is suitable for wearing in tropical waters. After the water is out of water, it can protect you from the burns of sunlight, and it can prevent the waterproof mother bite. It is elastic and thin. It is similar to a swimming suit.Buy.Wet Diving clothes are the most common submersible. It has different tailoring design and thickness. Therefore, within the water temperature range of 10 C-20 C, it can provide appropriate insulation effects.Dry Diving clothes keep you dry and get good insulation.It is the best diving in leisure diving insulation, especially when the water temperature is lower than 10 C, it is even more useful, but its price is also more expensive.