Getting sharper

I managed to get a bit sharper images. On  a photo forum I got an advice to direct the flash directly to the splash instead of the background. This way I can get more light, so I can decrease the power of the flash which results in higher speed. I gave it a try and it worked. So the blur on the edges of the photo came from motion blur. Interesting. Of course there is some drawbacks of the direct light. I cannot get the background patterns on the water and I get strong highlights. I suppose the ultimate solution would be the usage of a second flash. I will try that some time. Now I will concentrate on building a new controller.