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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.
When attempting to convert the color temperature of a daylight-balanced microscope light source, such as a xenon lamp or flash tube, for use with tungsten-balanced color film, one of the appropriate amber Kodak 85-series filters is inserted.hen attempting to convert the color temperature of a daylight-balanced microscope light source, such as a xenon lamp or flash tube, for use with tungsten-balanced color film, one of the appropriate amber Kodak 85-series filters is inserted.