Master, can the polarizer be used as a uv mirror?

UV mirror can filter out ultraviolet rays in the sun, so it is also called ultraviolet filter. Generally, it is colorless and transparent, but some of it will appear purple or purplish red at some angles because of the antireflection film. Many people buy UV mirrors to protect the precious lens coating, which is actually only an accessory function. UV mirror can weaken the blue tone caused by ultraviolet light. At the same time, for digital cameras, it can also eliminate the interference of ultraviolet rays on CCD, which is helpful to improve the definition and color effect.

UV mirror is actually a kind of ultraviolet filter, its main function is to absorb ultraviolet rays with wavelength below 400 nm, and it has no filtering effect on other visible/invisible rays. Because too much ultraviolet rays will affect the imaging quality, UV mirror is one of the necessities for traditional photographers, but for digital cameras and owners of digital cameras, because the imaging is a CCD photosensitive element, unlike traditional film, it is actually just a piece of flat glass, which mainly plays a role in protecting the lens. It can be said that its protection is far greater than filtration.

2. Polarizer

Also called polarizer, PL mirror for short, is a kind of color filter. The excellent function of polarizer is that it can selectively let the light that vibrates in a certain direction pass through, and it is often used to eliminate or weaken the strong reflection of non-metallic surface in color and black-and-white photography, thus eliminating or reducing the light spot. For example, in landscape and scenery photography, it is often used to show the texture of objects with strong reflection, highlight the scenery behind the glass, darken the sky and show blue sky and white clouds.

To sum up, only use polarizers when needed, and use uv lenses when not needed!