As a professional photographer for over 50 years and having changed to digital photography five years ago, I know all the problems associated with portable studio flash sync-leads, stands umbrellas etc etc. Having five flashguns accumulated over the years from the Canon 580ex, Vivitar, Sunpak etc I wanted a light weight portable system that I could carry with me that is very easy to set up, and wireless. These flash triggers worked perfectly with all my flashes every time even when fired in another room. Combined with the studio stand flash and umbrella holder they fulfilled my specific requirements perfectly.