Lightning shutter trigger - some more experience

On Friday, another thunderstorm hit our region. My son and his friend again took some pictures. This time, most of lightning flashes were too rapid for their cameras, and they took only a few photos. Lack of sensitivity exhibited in previous test for my device was not the limiting factor this time...

Here is the only picture my son was able to take:

This time, camera settings show in a better way that the picture was taken during the day: 1/125, f/8.0, 100 ISO. Place: near Tourtour, south-east of France.

11-May-2018 - Update: some time ago, I decided to build and test a new version of the trigger, adding an op-amp in order to increase sensitivity. Check this article.