Absorb UV and produce a warmer tone
Skylight filters give the same protection from UV rays as a UV filter, but due to their light pink colour will offset stronger blues and produce a warmer picture tone. Skylight filters are available as 1(A) and 1(B), with (B) absorbing slightly more of the blue and violet spectrum. Neither have any effect on exposure so no compensation is needed. They are especially useful when shooting slide films, which typically record images with a slight blue cast, especially in scenes shot in open shade.