UV (ultraviolet ray)-cut filter
The product is often used in place of a protection filter overseas.
Ultraviolet rays are a light beam having an invisible wavelength. When scattered by dust in the air, a distant view is sometimes blurred.
There are two UV cut filters: “L39” for cutting the wavelength of 390 nm or smaller and “L37” for cutting the wavelength of 370 nm or smaller.
As a ultraviolet rays cut effect becomes stronger, there is a tendency that the light becomes yellower.