Can't tell you much abt the cannon system, I use Nikon with TTL dedicated flash when shooting weddings. I purchased the bracket mentioned above and love it to death, best thing for keeping the flash above the film plane to keep the red-eye effect from showing up. I also bought an omnibounce reflector for the front of the flash and keep the camera settings on Auto and TTL and never miss a shot due to underexposure. I also have a battery pack to keep the flash recycling and can get through the entire wedding without worrying abt battery life in the flash. Nothing worse than getting ready for a shot with everyone posed, and the flash does not recycle due to low battery life!