The usual color films are designed for light with the color temperature 5500K. Only when a gray object with light of this color temperature is illuminated, the colors formed in the film are in balance and there is a neutral color rendition, that gray is reproduced gray; provided that the laboratory is no nonsense. With a higher color temperature playback appears blue, at a lower results in a yellowish / reddish color cast. While you can correct in the laboratory in the manufacture of a deduction slight color casts in negative film very easily, this is not possible with slide film. For this reason, there are color conversion filters that are colored so that they correct the color cast during the recording. They are reddish colored for light with high color temperature and blue for light with a low color temperature. Example: Blue sky and taking a shadowed subject. Here, the subject is not directly illuminated by the sun but by the blue sky. Guess what color that light again. Exactly: Blue! The color temperature is extremely high and the uncorrected recording will have a strong blue color cast. The skylight now corrects red towards. The picture will look more natural. Especially in the summer, by the sea and in the high mountains of the skylight is indispensable. The Blaustichverschwindet, skin tones are natural and green forests meet again from green. The original Hama Skylight Filter belongs to the holiday luggage!
