Karting in Lommel
Went indoor karting with my two boys in Lommel.
Stobist info: tied my 580EXII to a fence with a rubber band, set to slave mode, ETTL, camera left. My 7D controlled the flash remotely, using the camera's pop-up flash. Exposure on 7D was set to manual. Used 1/8th of a second to get the motion blur. The flash froze the subject itself. I pre-focused and then switched off autofocus.