Roscoe 1/2 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 # 3204 1/2 Blue CTB Color Conversion Gel Filter (20x24" Sheet)
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20x24" (51 x 61cm)
Boosts 3200K sources to 4100K. A partial conversion to compensate for varying daylight conditions and voltage reduction, or to boost aging HMI lamps and yellowed soft lights.