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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.
The term âdichroic lampâ almost always refers to low-voltage MR11 or MR16 halogen spotlights. The interior surface of these lights is designed as a multifaceted reflector (MR), with the purpose of gathering up the widespread light of the burning tungsten filament and projecting it forward through the front of the lamp.