Designed to fit the rim of the standard interfit stellar reflector the rb4001 4 leaf barn door set is an ideal option for adding directional light to the background the optional ac8011 colour filter set slots into the front of the rb4001 to provide coloured background or subject lighting please note these barn doors must not be used with tungsten or halogen lights interfit recommend turning off the modelling lamp when the filter set is in use at full flash power to prevent overheating