How to distinguish the quality of Sunglasses

Judging the advantages and disadvantages of Sunglasses can be examined from both quality and aesthetics.Aesthetic has personal factors, and quality is standard.The quality of Sunglasses mainly refers to the quality of the lens.At present, the world's general standards are the standards of the US Food and medicine and Health Inspection (F D A) standard.

1. According to the F D A standard, while the lens guarantees the light transmission rate, it is necessary to filter more than 90 % of the ultraviolet rays in the sun, and the lens should be labeled "UV-100protct10n"."UV-400protct10n" tag, so it is very important to check the UV tag on the lens.

2. The lens must not have the "degree" of optical lenses.Generally, if the refractiveness exceeds 15 %, it will feel dizzy when wearing.

3. The lens must have a high strength and pass the impact test.Generally speaking, the strength of plastic film (propionic acid or acetate), resin tablets, and glass tablets from small to large.

How to distinguish the quality of Sunglasses lens quality

1,Material of the lens

glass lens: wear resistance, but relatively speaking, its weight is heavier than other materials, and it is also easy to break.

Popular resin lens: This kind of lens is lighter than glass lenses, impact resistance, and is not easy to break, but the hardness is low, so it is easy to get hair and it is easier to have scratches.

2. The refractive index of the lens

The higher the refractive index, the thinner the lens, the higher the price.Such as the optical characteristics of the lens:SunglassesIt is a flat -light mirror, which cannot be littering, and should not have optical defects that affect vision.

The simple method of identification is to place the Sunglasses in front of the eyes and observe the distant targets through the lens, such as window frames or door frames, and then move the glasses up, down, back and forth, the target should not be swinged and wavy deformation.

3. The color of the lens

Sunglasses are divided into dark and light colors without color distortion.The choice of the color shades of the lens should be depends on the places of the required activity. Selecting different colors for different light sources and different use occasions, the color of the lens will affect the Shading effect.To enable Sunglasses to effectively block the strong light in summer, dark Sunglasses are needed, but if you wear a bike or drive, you should not choose a lens with darker colors.In addition, when Sunglasses are used for daily driving, they also need to have the ability to identify different color signal Lights.

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How to choose Sunglasses

1. Whether there is a polarized effect

The effect of polarizing can help us well distinguish between reflex light and objects under strong light, whether it is fishing, skiing, or driving people.Under normal circumstances, Sunglasses clamps will have this function, but the formal brand will have a polarizer test card, and it will be presented to consumers with the pattern of fish and water. Therefore, you can try it.To fish, it shows that its polarizing effect is good.

2. Whether there is ultraviolet function

When buying Sunglasses clamping, consumers must confirm whether this product has the function of anti -ultraviolet rays; if only the filtering function, it does not have ultraviolet function, it cannot be 100 % blocking ultraviolet rays.Essence

3. Check the structure of Sunglasses clamps

If it is not a formal brand, iron device is generally used, which will make the lens easily scratch and even cause damage to the eyes.On the contrary, if we choose a big brand, its quality will also be guaranteed. When the lens is in contact with it, it will avoid the separation of silicone.

How to use Sunglasses clamps

Poor Sunglasses designed for myopia people are effectively anti -glare and ultraviolet rays.It is especially suitable for outdoor sports such as driving, Outdoor, fishing, etc.Adopting polarized lens technology, the visual resolution is greatly improved.Eliminate 99%of reflection light and scattered light, making your vision more clear and Smooth.The lens is specially added to enhanced treatment, which is effective, scratch resistance, and impact.

Sunglasses clamps should be made from seven layers of special materials, each with its own functions.The polarization angle and the radian of the lens are designed according to the principles of precision optical.The wearers will never have the distortion and dizziness of the imitation products.Each lens is strengthened by the original factory, scratch resistance and difficulty in deformation, and broken.It can be used for a long time and the performance is unchanged.The production and materials of the Sunglasses clipped glasses have professional design and producers, which are comfortable and durable.

Sunglasses clamps are clamps or mirrors that are extended to design on the basis of mirror racks.It is often seen on the road that many people's glasses are also a pair of Sunglasses that can be turned down.When walking under the sun, just turn down the Sunglasses and cover the myopia lenses to play a role in Shading.When walking under the sun, the Sunglasses were fixed on the Myopia glasses rack. Others looked like wearing a pair of sun glasses; when I walked into the room, as long as the Sunglasses were taken off, it was a pair of close vision glasses.There are also three types of fixed Sunglasses, which are called "mirrors". One is to use magnets to suck directly on both sides of the mirror frame, and the other is to directly design the magnetic connection point in the bridge of the mirror frame.Another is stuck on the frame.In addition to ordinary Sunglasses, the lens also has a polarized lens.

For women who do not like Sunglasses, it is recommended that you buy Sunglasses directly, and Sunglasses also have the kind of optometry.

Let's talk about the steps of using clamps

1. First pinch the spring button of the clip to open the clip.

2. Squeeze the spring clip and clip from top to bottom in the bridge of the glasses.

3. Covered the clip to the glasses and adjust the position.

The above is the simple use step of the clamp. The clip can be selected according to the glasses style wearing.

Disclaimer: The above content is derived from the provision of the program system index or the sharing of netizens. It is for your reference only and does not represent the research perspective of this website. Please pay attention to the authenticity and authority of the source of the content of the content.Apply to delete & gt; & gt; error correction & gt; & gt;

[Types of Sunglasses] What are the types of Sunglasses?

What are the types of Sunglasses

When buying Sunglasses, many friends do not know which type of Sunglasses they need, simply pay attention to the ranking of Sunglasses brand, and choose according to their preferences.eyes, you need to take more care, so you should know more when choosing Sunglasses and less blind.What kinds of Sunglasses do you know?Let me introduce you in detail.

The Sunglasses can be roughly divided into the following:

1. Anti -light protection lens

This kind of lens can prevent strong light reflexes, allow you to see things from being disturbed in strong light, and clearer.The principle of this lens is actually very simple, that is, a layer of magnesium is applied on the surface.If you want to know if your Sunglasses are used in anti -light protective lenses, you can align the glasses at the light source. When you see the purple or green reflection, it means that there is a protective film on the lens.

2. color lens

This kind of lens is also called "dyeing lens". The Sunglasses using this lens can absorb the light of a specific wavelength. The principle is to add some chemicals during the lens production process to make the lens appear color.This lens is the most commonly used by Sunglasses.

Third, coloring lens

This kind of lens is actually the same as the color lens, but this kind of lens is generally used in a degree of Sunglasses. Among them, everyone is most familiar with "gradient -like coloring lens". The color is from top to bottom.From deep to shallow.

Fourth, polarized lens

The word polarization is used a lot in Sunglasses, but many people do not understand the specific meaning. In fact, this kind of lens is to filter the dazzling light emitted by the sunlight in an equal direction, and add vertical special coatings to the lens.outdoor sports (such as: maritime activities, skiing or fishing) are very suitable for use.

Five, color change lenses

Another name is "photosensitive lens".Originally transparent and colorless lenses, when encountering strong light, it will become a non -colored lens to protect the eyes. This is because this type of lens is added with silver chemicals.It is very suitable.

Sunglassesprecautions

If you understand these aspects, you can help when you buy Sunglasses. After buying, you must take care of your beloved Sunglasses!

[Method for polarizing mirror] How is the main purpose of polarizing mirror in polarizing mirror?

How to use Polarized mirror

There are two types of polarizing mirrors: round polarizer (Referred to CPL ) Line polarial mirror (simply referred to PL or LPL To.

They are in most consumer digital cameras (DC ) There will be no difference in upper. TTL Light metering function) SLR/DSLR Also DC And hope to share a polarizing mirror, it is best to choose a round mirror.In addition, the differences between line polarizers and round polarized mirrors, as well as why in modern times SLR/DSLR The reason to use a round Polarized mirror, in the clumsy book L.6 Zhang has a very careful explanation; but because it is not important for novices, it is omitted here. Interested friends, please refer to the clumsy book (there is a chapter in the link above PDF files).

There is a loop that can rotate freely on the Polarized mirror. Its function is to regulate the effect of polarizing mirror.The polarizer is usually two types: thick (general) type and thin type. The former may be thicker than the latter1mm Or more, when mentioning polarizers below, if there is no special explanation, it refers to thick (or general) polarizer.The thin Polarized mirror is for wide -angle or ultra -wide -angle lens, because too thick polarizing mirrors can easily produce dark corners.Generally speaking, if the camera lens ( 135 Movies) The equivalent focal length is at 35mm Above (including 35mm ), Thick polarizer should not have a dark corner; but if the focal length is less than 35mm The thick Polarized mirror is likely to produce dark angles, but this is usually related to the optical and mechanical structure of the camera mirror. It may not be the case for every lens, so it is best to try it before buying a polarizer.

The main purpose of polarizing mirror:

Reduce the reflection of glass, water surface, and non -metal surface, make the sky blue, and improve the saturation of the color of the picture.Because the Polarized mirror is dark gray, it will block part of the part that can reach the sensor chip Light, it will generally decrease1 arrive 1.5 Between Levels.In addition to the full manual exposure mode, the camera's optical metering system of the camera will be adjusted by itself in other (such as aperture prerequisites, or the shutter prerequisite) mode, but you still have to check whether the aperture or shutter speed selected by the camera will be used.

Reduce reflection

The reflection on the surface of the subject will wash away the details of the picture, or change the color of the picture. One of the most important functions of the polarizing mirror is to reduce or even eliminate the light that is reflected by the camera and enter the lens, but when the subject is metal, Polarizer The function is not very significant.The best angle of lowering or eliminating the reflection with a polarizer is that when the light source's irradiation angle and the camera shooting angle are made with the camera30 On the occasion, one (or two) deviates from 30 The time -effective use will be reduced, and the more effective the angle deviation is, the lower it will be.It is very simple to reduce the reflection with polarizers.After the composition is completed, rotate the ring in front of the Polarized mirror, and watch the scene window (or LCD/EVF ) The effect of polarizing mirror will be displayed. Once the desired effect is obtained, stop rotating and shooting.It should be noted that polarizing mirrors are not universal, and it is likely to be unable to completely eliminate reflection.

The most well -known application of polarizing mirrors is to deepen the blue of the sky, making the blue sky and white clouds stronger; however, if the sky is not blue (such as a cloudy day), no matter how good the polarizer is, the blue sky cannot be shot.But we should It is time to understand that only one of the sky will become bluer, and the other may not change. More importantly, the shooting angle must be selected correctly.There is a very simple rule for choosing shooting angle, first extending the index finger To the sun, then erected the big fingers vertically with the index finger, and turning around the index finger, so the direction that the Mark finger passes is to get the most effective shooting direction; in other words, the best shooting direction and the direction from the camera to the sun to the sun Droop straight!Please pay attention, the Mi fingers passed by360 Degree, except for the middle of the right, this time, this 360 Some parts in the sky, part of the ground to the ground, to the sky is the direction that can turn the blue and become blue.When the camera deviates from this direction (such as the shift in the sun or the anti -sun direction), the lower the effect. If it is more than a certain angle, the effect will not be significantly or even disappear.After looking for the direction of shooting, slowly turn the ring in front of the polarizer, and take the shutter after getting the expected effect.

In addition, because polarizing mirrors will reduce or even eliminate the reflection of the subject, the color of the picture shot with polarizer is also more pure than it is not in time, and the contrast is also higher. This is the theme of the next section.

increase the saturation of contrast and color

The reflection of the subject will cover up the original color and details. If the reflex characteristics of the subject in the screen are similar (such as the leaves), a faint reflection not only erase the original color, but also reduce the contrast of the picture. In this Affection In the case, the use of polarizers has the effect of reducing reflection, reproducing the color of the subject, and improving the comparison of the picture.The lower left photo is added with a polarizer but the lowest effect is used, and the lower right is the maximum effect; these two are extremely strong In contrast, the reflection of the leaves under the scorching sun distused the color of the woods, but to maximize the effect of polarizing mirror, and the color of the wood and the grass appeared, making the two photos very different.

If the camera cannot be equipped with polarizing mirror?

Many small and stylish digital cameras can neither install filters nor adding sleeves, but we can hold a polarizer in front of the camera to shoot, but how to adjust the effect of polarizing mirror?The method is very simple. First of all The direction of the mirror on the shooting of the lens (so the closer to the camera, the better), see the lower left photo; then turn the ring on the Polarized mirror, stop after the expected effect (below); finally move the adjusted polarizer to the lens to the lens Ahead (below Right), but the polarization mirror cannot be rotated, because once the direction of the polarization mirror is changed, the desired result is not available.

Practice this procedure several times, and try to take some photos to compare the results of use without polarizing mirrors. After several times, they will be handy.Most lightweight digital cameras have a small diameter, small,37mm The Polarized mirror is usually large enough (if it is suspected 37mm Too small, just use it 43mm ; 37mm Too big, try to try it 28mm ), Bring a polarizer with you, you can easily take photos with saturated color, blue sky and white clouds, and high contrast during travel.

precautions for using polarizers

First, polarizing mirror may be the most important filter in digital photography. It can reduce or even eliminate the light reflected by the subject, turn the sky blue, improve the saturation of the comparison of the picture and color.

Second, most consumer digital cameras can use line polarizers, but the vast majority (especially those with autofocus and metering function)SLR/DSLR You can usually only use a round Polarized mirror.If a Polarized mirror is used at the wide angle end, a thin Polarized mirror should be used.

Third, the use of polarizers will lose1 arrive 1.5 Grade light will affect the aperture or shutter speed of the selected; in other words, it is likely to use a large aperture (so the depth of the depth of the scene) or the slower shutter speed (then the movement of the movement It may be blurred and easily shake the camera), so you should pay attention to the aperture and the shutter speed.

Fourth, although the polarizing mirror has the effect of reducing reflection and turning the sky blue, but this effect is related to the angle of shooting. If the shooting angle is wrong, it is likely that the expected effect will not be obtained.Furthermore, when shooting with a wide -angle or ultra -wide -angle lens, because the viewing angle may be greater than the best angle of the polarizer, the sky in the screen may appear from very deep to quite light, that is, the blue color with uneven concentration.

Fifth, it is best to remove it from the lens when there is no need to use a Polarized mirror.1 arrive 1.5 In the secondary light, the second is because the effect of the polarization mirror is set to and the effect is more or less, so the polarizer may sometimes cause the anti -effect (such as filtering the expected reflection).

This article introduces the basic concepts, usage, and effects of polarizing mirrors, and lists some precautions when using polarizers.The effect of polarizing mirrors is difficult to simulate post -made software, even if the sky turns blue.if The boundary between the sky and the ground is relatively simple. When the post -made system is selected, it is easier to change the color depth. Once the boundary becomes very complicated, the part of the sky is a time -consuming and laborious job. Objects, it is better to use Polarized mirror to adjust the effect when shooting.Furthermore, if the picture loses the details due to reflection, no matter how good the post -made skills are, there is no way to make the details and color that has not been recorded. Come.For these reasons, polarizing mirrors are a filter that cannot be completely replaced by post -made software.

What kind of material is polarized lens?

The material of the polarizer is two types: resin polarizing mirror and glass polarizer.

1. Advantages of resin polarizing mirror

(1) Light weight.

(2) It is not easy to rupture: In case the lens is crushed, not only has few fragments, but also not sharp, which can minimize the situation of eyeball and facial injuries.

(3) You can dye: Resin lens is easy to dye, and it can be matched with clothing and popularity.

(4) It can cover ultraviolet rays: almost completely covering ultraviolet rays with a wavelength of less than 350mm, and the effect is far better than glass lenses.

(5) Strong anti -fog: Because the thermal conductivity of the resin lenses is lower than that of glass, it is not easy to cause blurred unknown due to steam and hot water and gas, and even if it is blurred, it will quickly retreat.

(6) Anti -dental remarks: Generally, high -heat and small volumes are prone to dental and spots in glass sheets, but if you encounter resin lenses, it will automatically bounce, and will not cause any traces on the surface of the lens.

(7) The surface reflection of the resin lens is lower than that of ordinary glass sheets, and it is not dazzling.

(8) There is no color difference between resin dual -light lenses. This is due to the entire structure of the resin dual -light lens.

(9) The range of resin lens anti -chemicals and solvents is extremely wide. Almost all household solvents and chemicals will not affect or damage it.

2. The disadvantages of resin polarizing mirror

(1) It is easy to abrasrate: The scratch resistance of the resin lens is worse than that of glass lenses, but it can be improved by surface hardening, but the effect is limited.

(2) It is prone to deformation when installing the frame: This is because the density of plastic lenses is lower than that of glass lenses.

(3) Infinitive high temperature: Although the resin is a thermal solid material, once a multi -layer membrane is plated, the surface of the multi -layer membrane may cause cracking due to high temperature.

3. Advantages of glass polarizing mirror

(1) Large hardness: The surface is not easy to be scratched, and it is more abrasion than resin.

(2) Large density: The loading is not deformed, which affects its polarizing effect because it is improper.The density of the resin tablets is smaller, and it is much stronger than the glass sheet. If it is not installed, or the shape of the glasses itself is not very consistent, it will deform, affecting the polarizing effect.

(3) Strong light transmittability: The light transmission of glass sheet is generally stronger than the lipid tablets and stronger clarity.

4. Disadvantages of glass polarizing mirror

(1) Heavy weight: Because its density is more than resin tablets, general glass glasses are heavier than resin glasses.

(2) Fragmentation: As we all know, the glass is fragile.Therefore, its ability to just fight is poor.

(3) Variest prices: The polishing technical requirements for polarizing glass chips are high and the production process is more troublesome, so general glass polarizers are used for mid -to -high -end glasses.

Principles of polarizing mirror

Polarized lens is only allowed to pass through the light of a specific polarized direction in natural light.We all know that light is transmitted in line, which is the particle nature of light; at the same time, light is also spread in the form of waves. This is the volatility of light, so light is also called light wave.Light waves have vibrations in all directions, and polarizing mirrors use the volatility of light.

The core of the polarizing mirror is polarizer, and the polarizing film has a two -way transparent thin film. It allows the light vibration of parallel and light transmittance shafts, and light vertical in this direction is absorbed. This phenomenon is called polarizer of light vibration.change.The light passed through the same vibration direction is called polarized light.The reflection light is absorbed vertically with the light transmittance shaft of the polarized film because the light is reflected.The polarizing mirror uses this principle, which effectively eliminates strong reflected light and scattered light, making the light softer, so that the scenery that people see is naturally clear.The polarizer can also effectively absorb 99%of UVA and UVB to protect the eyes well.It is the first choice for driving, hook fish, skiing, tourism, etc.

But polarizing mirror is not a perspective mirror. When buying polarizers, there will be a test film with some pictures, as long as the Polarized mirror can be seen.In fact, this test film is specially made. It is to use the polarizers to make the polarizer see the parallel light shot from the picture inside, so that you can see the picture hidden inside, not perspective.The method.Now some manufacturers have produced mahjong cards with polarizers, and parallel light images are embedded behind the card. As long as they wear polarizers, they can know what cards are from the back of the card!

How to identify the good or bad of polarized lenses

1. Under normal circumstances, polarizing Sunglasses are affixed with obvious electrostatic electrostatic standards on the lens, or the polarizer lens is marked on the product tag.

2. When buying polarized Sunglasses, you can test it with polarizing test films.Some of the patterns on the test film cannot be recognized with the naked eye, and the polarized lens can be clearly identified.

3. According to the display principle of the LCD screen, observe the liquid crystal screen such as phones through polarized lenses, when the screen is rotated, the screen will also turn into a black screen with rotation.Essence

The advantages and disadvantages of the lens are the decisive factor to measure the quality of a pair of glasses, so consumers must be careful when buying the lens.glass lens is wear -resistant, but relatively speaking, its weight is heavier than other materials, and it is also easy to break.Popular resin lens: This kind of lens is lighter than glass lenses, impact resistance, and is not easy to break, but the hardness is low, so it is easy to get hair and it is easier to have scratches.

Disclaimer: The above method stems from the index of the program system or the sharing of netizens. It is for your reference only and does not represent the research perspective of this website. It proves that it is valid. Please pay attention to the authenticity and authority of the source of the content of the content.Apply to delete & gt; & gt; error correction & gt; & gt;