What are the commonly used neutral grayscale filters? What is the difference between the polarizer f

Polarizers Polarizers are made by bonding two layers of glass, sandwiched between a layer, and oriented crystals are made into a thin film, and these crystals are arranged in order. Polarizers are mounted on rotatable frames, and by rotating the frame at high speed, the polarizer is used in several ways in photography

A: Eliminate or weaken reflections on non-metallic surfaces.

Such as glassware, display windows, water surfaces, paint and reflective surfaces of plastic surfaces.

b: Control the brightness of the sky to make the blue sky darker.

When shooting outdoors or in landscapes**, sometimes it is necessary to control the brightness and darkness of the sky tone in the picture to darken the sky, so as to achieve the distance between the brightness of the sky and the brightness of the ground scenery in the picture, and adjust the tone of the picture. For example, the blue sky pressure orchid and the white cloud shadow tone are more prominent.

c: Used as a variable neutral gray color filter.

Two polarizers can be stacked on top of each other to be used as a variable neutral gray mirror.

d: Increase the color saturation of color images.

The polarizer can be used to weaken or eliminate the polarized light, and at the same time eliminate the reflected light, the color saturation of the image can be improved to varying degrees. In color landscape photography, the use of polarizers has been widely emphasized, and the use of floral still life has also obtained colorful, clear and pleasing color masterpieces.

Gradient gray mirror For example, the building under the bright sky, because the sky is too bright, the building is relatively dark, so it is difficult to take care of the two. In this case, use the gray part of the gradient gray mirror to reduce the brightness of the sky by 2 EV, and the bottom part will remain as usual, so that both themes can be taken into account.

Polarizer and gradient gray are somewhat similar when used to darken the sky, but the principle is completely different, the polarizer mirror only allows the light perpendicular to the polarization axis to pass, the light in the other direction can not pass, turn to a certain angle, the light from above the sky will pass less, can highlight the effect of the blue sky and white clouds, and the biggest use is to resist the reflection of the surface of the shooting object, such as glass, water, metal cards, etc.

It's best not to use two filters at the same time, because it's not necessary, the polarizer itself has a darkening effect.

There are two types of polarizers: circular polarization and linear polarization. It should be remembered that the circular and linear are not related to the physical shape of the filter, but to the way the filter processes light. It is important to note that the AF function of some autofocus cameras will fail in front of the polarized filter.

DCs generally have AF capabilities, so DC users are better off purchasing a round polarizer.

The polarizer is composed of two layers of lenses, so it is thicker than a normal filter, which occurs when using a wide-angle lens, especially an ultra-wide-angle lens, and the polarizer hides the surrounding corners of the lens. Generally, civilian-grade DC lenses do not have a wide angle, so this phenomenon is less likely to occur, but when using various DSLR digital cameras, users often have to use ultra-wide-angle lenses of 20mm or less due to CCD limitations. At this time, you should be careful when using a polarizer to see if the frame of the PL will cover the four corners.

A good suggestion is to buy an ultra-thin garden polarizer, which sells for much more than a regular PL, but guarantees the integrity of the final image.

It's not the same. The medium gray density mirror is referred to as ND mirror, and its function is to filter light, which means that it has the effect of weakening light, and has no effect on the color of the scene. Neutral grayscale lenses are available in a variety of densities, such as ND2, ND4, ND8, etc., depending on their ability to attenuate light, and need to be increased by one or several stops**.

It is usually used when a slow shutter speed is needed and the ambient light is bright. If you want to express the motion under the waterfall, slowing down the shutter speed will overexal, and a suitable medium gray density lens can solve the overexposure problem well.

Polarizers, abbreviated as PL or CPL mirrors, are also known as linear bias and circular polarization. It is a filter that filters polarized light in light, which is used to eliminate or reduce strong reflections on the surface of objects, and also to darken the brightness of the sky to make the colors appear more saturated.

Polarizers also attenuate light, but also increase the amount of light.

The first and three filters have their own different uses, each acting in different environments, or meeting the different needs of photographers. Polarizers are used to reduce reflections that affect imaging (e.g., air, glass reflections); Gradient lens to enhance the image latitude of the highlight than the target (e.g. backlit landscape shots); The purpose of the filter is to reduce the ability to extend the shutter speed (e.g. when shooting a waterfall and other scenes that take a long time). The usage rate depends on your daily shooting content choice, and there is no absolute one that you use more, because these are all filters used in special occasions, and ordinary indiscriminate use will only ruin the image quality.

If it were me, I would have chosen a gradient mirror and a filter mirror, but not everyone is like me, and quite a few people will choose a polarizer as well, which varies from person to person.

Second, the polarizer is generally round. It is best to choose a square mirror with an insert holder, so that you can freely adjust the position of the dividing line of the gradient. If the filter is round, it cannot be superimposed; The square one with the insert holder can be stacked (it can also be used with a gradient mirror).

3. The blackness of the filter lens depends on the subject matter and the shooting environment. Even if it's the same scene, if you use nd8 at noon, then you need to use nd4 at 4 pm. If you want to be insured, then buy nd8 to increase the shutter time to reach the amount of nd4.

It may not be difficult for you to find that none of the above questions have the right answers, because photography is not a set of parameters that go all over the world, and it is highly sensitive to the environment. Therefore, it is recommended that you do not rush to buy and wait until you realize that you really need it. Because if you buy it for the pleasure of exploring the functions of the equipment, you will put it aside if you don't need it after playing with the energy of the previous few days.

Medium gray mirrors, also known as ND filters, play a role in reducing light entering the lens and reducing sensitivity.

Polarizers, also known as polarizers, referred to as PL mirrors (CPL is a circular polarizer, which does not affect the focus of the autofocus lens), are commonly used to eliminate or weaken reflections on surfaces such as glass, thereby eliminating or reducing light spots. Darkening the sky and expressing blue sky and white clouds, etc.

1: Is there a medium gray mirror used to shoot the starry sky at night?

It may be used in some special cases, but it is not necessary.

2: Which one is suitable for daily travel?

Tourist commemorative photos are generally not used, if you want to use it in landscape photos, basically the gray will be greater than the polarization, but it also depends on what scenery is more, if there are more water features, the polarization is more.

PS: Basically, this kind of filter will have less impact on the image quality if it is around 800 or above. Basically, the use of those that are not in this range has a great impact on the image quality.

I hope the above can help you, and if you have any questions, please feel free to ask and discuss. If you're satisfied, remember to adopt it in time!

Summary. The main function of the grayscale color filter is to change the tone of the image, making the image softer and more natural. It can convert the colors in the image to gray, making the image look softer and more natural.

The method of using the grayscale color filter is very simple, first, open the image you want to process in the image software, and then, select "Filter" in the menu bar, and select "Grayscale" in the pop-up window to complete the use of the grayscale color filter. The use of grayscale color filters can make the image look softer and more natural, and it is possible to convert the colors in the image to gray, thus making the image look softer and more natural. In addition, grayscale color filters can also be used to change the contrast of an image, making the image look more vivid and vivid.

The main function of the grayscale color filter is to change the tone of the image, making the image softer and more natural. It can convert the colors in the late image to gray, making the image look softer and more natural. The method of using the grayscale color filter is very simple, first, open the image you want to process in the image software, and then, select "Filter" in the menu bar, and select "Grayscale" in the pop-up window to complete the use of the grayscale color filter.

The use of grayscale color filters can make the image look softer and more natural, and it is possible to convert the colors in the image to gray, thus making the image look softer and more natural. In addition, the grayscale color filter can also be used to change the contrast code of the image, making the image look more vivid and vivid.

I'm sorry I don't understand, but can you elaborate on that?

The main function of the grayscale color filter is to convert the color image into a grayscale image, so as to remove the color information in the image and retain only the grayscale information. The grayscale filter can convert the color image into a grayscale image, so as to remove the color information in the image and retain only the grayscale information. Grayscale filters can convert color images into grayscale images, so as to remove the color information from the image and retain only the grayscale information.

Grayscale filters can convert color images into grayscale images, so as to remove the color information from the image and retain only the grayscale information. The use of grayscale color filters can improve the efficiency of image processing, as grayscale images are processed much faster than color images. In addition, grayscale color filters can also be used for image compression, as grayscale images have much smaller file sizes than color images.

In addition, grayscale color filters can also be used for image analysis, because grayscale images can more easily extract the details in the image, making it easier to perform image analysis. In addition, grayscale color filters can also be used for image detection, as grayscale images can more easily detect features in the image of the lifting stove, making it easier to perform image detection. In short, the main function of the grayscale color filter is to convert the color image into a grayscale image, so as to remove the color information in the image and retain only the grayscale information, so as to improve the efficiency of image processing, and can be used for image compression, image analysis and image detection.