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.
Filter factor is approx.
Without it, strong yellow-orange color tones would occur. Filter factor is approx. This filter makes possible the use of daylight film in artificial light with a color temperature of about 3000 degrees K without the color overtones. Filter factor is approx. Depending on the percentage of red, conventional household bulbs require extreme color temperature conversion whenever daylight color film is being used indoors.