Is the polarizer useful?

Question 1: Is it necessary to buy such a good polarizer? The most important thing that is expensive and cheap is the transmittance of the lens, which is the degree of influence on the image quality. Generally good polarizers, such as B+W, are covered with copper rings, and the lenses are also highly transparent. Of course, wearing a general hood is already a luxury. If it is a good lens, it must be used well.

Question 2: Is it necessary to have a polarizer? The most important thing is the transmittance of the lens, that is, the degree of influence on the image quality. Generally, a good polarizer, such as B+W, is surrounded by copper rings, and the lenses are also highly transparent. Of course, wearing a general hood is already a luxury. If it is a good lens, it must be used well.

Question 3: Is the general SLR lens better equipped with uv lens or polarizer? This function is different.

UV mirror was originally used to prevent ultraviolet interference, but now this function is basically unnecessary, so his current function is basically to protect the lens.

Polarizers can make the sky bluer and eliminate some specular reflections, such as water and metal surfaces. This function is easy to use, but it needs to be readjusted every time. Even if you are in the same position at the same time, you need to readjust as long as the angle changes slightly. It is necessary to shoot the scenery, and it also has the function of protecting the lens, but the problem is that because of the dark color, it affects the light passing and shutter speed, and it will probably drop two files. Outdoor problems are not obvious, but indoor problems are different. For example, at night, it is difficult to open the shutter for one sixtieth of a second without using a flash and a fluorescent lamp in the room. If you hang polarization, it is basically a paste. ...

So polarization is a good thing, but you can't always ignore it like hanging your head.

Generally speaking, both shots are necessary. However, if you think that the lens generally does not need protection, you can actually add polarization without UV.

Pure hand tour, hope to adopt.

Question 4: What is a polarizer? What's the difference between it and a UV mirror? What is the function? Polarizer can eliminate part of the reflected light and improve the clarity and expressiveness of the captured image. It can eliminate the light reflected from bright surfaces such as water or glass. In addition, it can also increase the color saturation, so that the colors of blue sky, green leaves, ridges and buildings are more vivid.

UV mirrors are uv-proof, such as taking pictures in mountains and snow. But now the CCD of digital camera generally has anti-ultraviolet coating. Therefore, the current UV mirror basically only plays the role of protecting the lens.

Just choose a brand, such as Kengo. According to the caliber, the price is generally around 200 to 400 yuan. The price of high-end brand B+W is between 800 and 2000 yuan.

Question 5: What are the advantages and disadvantages of adding a polarizer in front of the UV mirror? No matter what mirror is added, it will affect the imaging quality, but the higher the quality, the lower the influence of the filter on the imaging.

When using wide-angle end for ultraviolet polarization, we should pay attention to the possibility of dark angle. The polarizer is composed of two parts that can rotate relatively, so it is relatively thick, and dark angle will appear when uv is wide-angle.

I was cheated.

Question 6: Is the usage rate of polarizer high? Domestic filter screen, known as German origin, is a bit expensive. Among the polarizers I use, Rowen made in China has high quality, exquisite workmanship and moderate price, especially a green film.

Question 7: Is it necessary for photographers to be equipped with color subtractors and polarizers? There are many landscapes, and the polarizer is still practical.

Especially when there is water, buildings and bad air sometimes,

ND mirror mainly depends on the subject matter you shoot, and a long shutter at night is very useful, mainly depending on the feeling of flapping or stillness, which is not very close to the subject matter you mainly shoot.

To tell the truth, PS can solve too many problems, but in order to save worry and trouble in the later stage, the most important thing is that the composition is convenient for later adjustment.

Stray light interference is a very troublesome factor, so it is recommended to put the polarizer first.

Willing to take a night view, or like to take a combination of static and dynamic photos, and then enter nd, such as taking waterfalls and running water.

Question 8: Is it really necessary to install a polarizer in the lens of a SLR camera? Where is the polarizer suitable for use? Polarizer 1 should be used in rainy days, at night and when it snows. It is very obvious to reduce the reflection of glass and water, especially when shooting through glass;

2. Shooting the sky will make the color more saturated.

Question 9: Is a polarizer worth tens of dollars useful? There are two kinds of polarizers. One is linear polarizer, also called ordinary polarizer, and the English symbol is PL; The other is a circular polarizer, the English symbol is CPL, and the appearance of ol is gray, which can let the linearly polarized light with the same polarization direction pass about 80%, while the linearly polarized light vibrating perpendicular to its polarization passes less than 1%.

The appearance of CPL is gray, which is made of a linear polarizer and a quarter-wave plate (a special birefringent material). The optical axis of quarter-wave plate makes an angle of 45 degrees with the vibration direction of polarized light of linear polarizer. Light enters from a part of the linear polarizer in the forward direction and enters from one end of the quarter-wave plate in the reverse direction. The natural light emitted to the circular polarizer passes through the linear polarizer and the quarter-wave plate in turn, and then becomes circularly polarized light. According to the different relative orientations when the polarization direction of the linear polarizer makes an angle of 45 with the optical axis of quarter-wave plate, right-handed circularly polarized light or left-handed circularly polarized light can be generated. At present, the common circular polarizers on the market are Toshiba, Gaojian, Yangao, Baogu, Marumi, Nikon and HAMA.

Generally speaking, both linear polarizer and circular polarizer can meet the basic requirements of photography. However, PL will affect metering and autofocus, and is generally not suitable for digital cameras with high degree of automation. Because today's digital cameras have the functions of auto-focusing and auto-exposure, on these cameras, part of the light will be reflected to the metering element. If these rays are reflected by a semi-transparent and semi-reflective mirror, and this semi-transparent and semi-reflective mirror is made of non-metallic material with coating, then the rays they reflect are polarized light. Digital cameras with high degree of automation use ordinary linear polarizers, which will filter out some light information, which may lead to inaccurate AE (automatic exposure) and out-of-control AF (automatic focusing). But CPL works well on this camera.

Skills of choosing polarizer

CPL is more expensive than PL. If the camera can use PL, there is no need to buy CPL. Then, can your camera use PL? Just try it. Try AF first: Turn the PL mirror to different directions, and press the shutter halfway to turn on autofocus (some bodies have AF buttons). If autofocus can work normally in any direction, it shows that this kind of fuselage can use PL mirror to realize AF function. On the other hand, if AF fails in a certain direction, you must buy CPL；; Re-experiment AE: After installing PL mirror in front of the lens, measure light vertically against a uniform white wall. Rotate the PL mirror to different directions, and carefully observe whether the luminosity value has changed. If there is any change, you can only buy CPL.

Because the polarizer can also reduce the exposure of 1~2, it can replace ND2 and ND4 neutral gray-scale mirrors in some occasions.

It takes some skill to use a polarizer well. For example, when shooting the sky, you can use your right hand to orient your thumb and forefinger at 90 degrees, with your forefinger pointing to the sun and your thumb as the best shooting direction. In addition, because the polarizer will lose the aperture of 1/2 to 2 when the polarization effect is the best, exposure compensation is needed, and generally the exposure of 1 2 will be increased. For the reflection of the metal surface that cannot be filtered, a large polarizer can be added in front of the light source to make the light reflected by the metal polarized, and the reflection of the metal surface can be filtered by the polarizer. However, in portrait photography, it is best not to use a polarizer, because it will filter out the reflection of the face and make the face lose its three-dimensional sense.