What are the commonly used medium gray filters? What's the difference between it and polarizer?

Neutral grey mirror, also called medium gray density mirror, or ND mirror for short, is used to filter light. This filtering function is non-selective, that is to say, the reduction ability of nd mirror to light with different wavelengths is equal and uniform, and it only plays the role of weakening light, and has no influence on the color of the original object, so it can truly reproduce the contrast of the scene. Neutral gray-scale mirrors have a variety of densities to choose from, such as ND2, ND4 and ND8 (which require one, two and three exposures respectively), and can also be used in combination with multiple neutral gray-scale mirrors. Polarizing (vibrating) mirror: it can weaken the reflected light on the surface of an object. Exterior photography can make the blue sky bluer, with sharp contrast and saturated colors. You can also reduce the reflection where there is reflection on the object. Black-and-white and color photography are acceptable. When shooting, you need to add 2 levels of exposure, which is a necessary filter for photographers. Their differences are as follows: the medium gray density mirror weakens the light, which weakens the light input to the lens; Polarizing light (vibrating mirror) is used to reduce the reflection of objects where there is reflection. For example, when shooting leaves, porcelain and other things with large reflection, it can reduce the reflection and is not dazzling.

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