Roscoe 3/4 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.
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Rosco # 3203 3/4 Blue CTB Color Conversion Gel Filter (20x24" Sheet)
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20x24" (51 x 61cm)
Boosts 3200K sources to 4700K. Used when a partial conversion is desired, or when daylight is below 5000K