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Light balancing filters used to decrease colour temperature slightly for a warmer tone.
As their name suggests, these filters use HOYA coloured glass. They are used for colour correction of different light sources when using colour film, or for controlling contrast with black and white film. Colour correction filters are important as colour films do not have the flexibility of the human eye to automatically adjust to different situations. Black and white films register colours as shades of grey and the rendition of each colour in a scene is important, so filters can be used to do this. The colour of the glass in all these filters is carefully controlled and to reduce the possibility of colour shift over a period of time, such high quality filters are coated or multicoated on both sides. This maintains the desired effect and gives a long service life.
