Put simply, UV filters reduce haziness created by ultraviolet lights.
Lets have a quick physics lesson. Ultraviolet light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than x-rays, in the range 10 nm to 400 nm. If you own a film camera then you might know the reason you use a UV filter.
It all down to colour film having 3 sensitive layers, one to red, one to blue and one to green (RBG). The blue layer responses to UV light as well as blue light, if you take an image which lots of UV light the blue layer becomes overexposed and your image takes a blue colour.
You can buy different strength UV filters, stronger UV filters will stop more blue light and will leave the image with a slight yellow tone.
This article comes from photography edit released