What is a polarizer? What's the difference between it and a UV mirror? What is the function?

Polarizers and UV mirrors are both filters for cameras, but their uses are quite different:

UV is the abbreviation of Ultra Violet, and UV mirror is actually a filter used to block ultraviolet rays. Because the imaging principle of human eye and film (including the photosensitive original of digital camera) is different, the camera can see ultraviolet rays that we can't see, so many times when the human eye sees a clear picture, the camera will shoot a gray effect. The color is not bright enough, and you need to use a UV mirror when the sun is too strong. But now many lenses are coated with UV, and some digital cameras add UV filters in front of the photosensitive original, so the UV mirror is not so important, and some inferior UV lenses may affect the image quality. ?

A polarizer is a lens used to filter reflections. Natural light is emitted from the light source and reflected by the surface of the object, and the nature of the light is secretly changed. We call this light polarized light. The human eye cannot distinguish polarized light from natural light, so we can't "see" this change intuitively. A polarizer is a filter that filters out polarized light, lets natural light pass through, and artificially removes the influence of "reflection". For example, when shooting a large area of water, you can get rid of the annoying reflection on the water and shoot the underwater scenery; When shooting glass windows, you can eliminate the reflected light on the glass and shoot the exhibits in the glass windows.

The prices of ultraviolet rays and polarized lenses range from tens to hundreds, and the brands are Kengo, SUNPARK, Panasonic and Canon. Be sure to choose a high-quality lens to avoid affecting the picture quality.