Uv Filter, also known as ultraviolet filter, refers to a filter used in digital cameras, which plays a role in protecting the lens and improving the picture quality. UV mirrors are usually colorless and transparent. Some will appear purple or purplish red at a specific angle due to the addition of antireflective film.
UV lens is usually used to protect the delicate lens coating. In fact, this is only one of its auxiliary functions. UV mirrors can reduce 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 helps to improve the clarity and color effect. However, due to the popularity of CMOS, the sensitivity to ultraviolet light is greatly reduced, so the role of UV mirror is becoming smaller and smaller. UV mirror with average quality may sometimes play a negative role
The main function of UV mirror is to absorb ultraviolet light with wavelength below 400 nm, and has no filtering effect on other visible / invisible light. It can filter ultraviolet rays because the lens contains lead, so the UV lens is heavier than other lenses of the same size and thickness. At the same time, the UV mirror can avoid the direct contact between the lens surface coating and the external environment, which plays a protective role.
UV mirror is suitable for shooting in the environment of seaside, mountain, snow field and open area, and 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 clarity and color restoration effect
