Last night I was at the event with my friend. I operated a photobooth with studio flash trigger strobes RT-04, and my friend had photo coverage of the event. Every time my friend took a photo the studio flash also fired. He is using Canon 6D with Speedlite 580EXII.
Please help me to figure out how to not fire the studio flash when my friend takes pictures. The pictures on my photobooth turned out black when we were doing photobooth and photo coverage at the same time.