I have three cactus v5 remote triggers. I also use Canon equipment. I want to be able to fire both a wireless trigger and an on camera flash at the same time. The wireless trigger would fire an off camera flash and then the on camera flash would be used as fill light.
This would be useful in a wedding situation for example when you have an assistant placing an off camera light, but in some situations you want to light the shadows a little bit.
Thanks,