For the second shot I had increased the delay a lot to 40 msec. Because of this the soap bubble
Was already exploded quitte far. To get a nice picture the delay was too high. You can also see all kinds of reflections in the bubble caused by some pictures that were placed around the set-up. The reflection of these pictures gives a better lightsegmentation and contrast into the soap bubble. Without these extra pictures it is difficult to see the difference between the soap bubble and the background.