Due to its light pink colour, the Formatt 5.65x5.65" Skylight (1A) optical filter in Crown Schott-Desag B270 glass reduces the bluish cast of daylight and produces a more pleasant and warmer image tone. A wise investment, it also helps protect your lens from dust, moisture and scratches, which can lead to costly repairs. Formatt, a company with three generations of experience in manufacturing professional filters, produces each filter to the highest technical standards. The finest materials, combined with state-of-the-art production technology, have achieved a level of optical excellence unmatched elsewhere. - Skylight 1A filters are slightly pink-tinted - They offer 45.5% UV ray absorption - Useful for shooting in the shade in clear weather and in cloudy conditions