Ultraviolet (UV) Filters
Cut out the light that you can't see
Film is sensitive to UV rays in daylight that are invisible to the eye. UV filters are used to absorb these ultraviolet rays, which can give outdoor photographs a blue colour cast and a low-contrast haze that diminishes detail.
UV filters absorb the UV part of the spectrum without affecting exposure or the light that is visible to us. They create little to no change in colour balance, and no exposure compensation