It creates cooler colors and corrects for the warming tendency of some color films.
Filter factor is approx.
Red tones, which are in the middle color temperature range, are eliminated with the KB3.This filter corrects the frequent tendency toward reddish tones when using 500 Watt flood lights with tungsten film. The KB3 is also necessary when using older nitrate photo lamps. Filter factor is approx. This middle-blue filter reduces the strong red tendency of morning and evening light. This filter is used for the optical reduction of extreme yellow, orange and red elements of scenes.