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Rosco CTB Blue overview. Roscoe Full Blue CTB Color Conversion Gel Filter - This filter is traditionally used to convert tungsten lighting to daylight. CTB (Color Temperature Blue) filters are available in a full spectrum of degrees (strengths) which, depending on your needs, can be used to either raise the temperature of your lighting or to create different lighting interpretations. CTB filters offer you complete control when shooting under tungsten lighting.
For example, if a light source has a color temperature of 3000 K (often found in older microscopes with a tungsten lamp), the microscopist could adjust the apparent color temperature to 3200 K with an 82A filter for use with type B tungsten-balanced film, or to 3400 K with an 82C filter for use with type A film.