Roscoe Double 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.
In the Box
Rosco # 3220 Double Blue CTB Color Conversion Gel Filter (20x24" Sheet)
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20x24" (51 x 61cm)
Boosts 2800K sources to nominal 10,000K. An over-correction filter designed for special applications.