Calumet 43" (109cm) Satin White Compact Umbrella The umbrellas are big and create a nice diffused light. Easy to set up.orks well to diffuse the light from any Flash/Strobe Light and Constant Light Works well to diffuse the light from any Flash/Strobe Light and Constant Light this umbrella features an efficient satin-white interior with a fixed black backing. It produces a pleasing soft, but crisp effect.