I just purchased 4 of these wireless triggers along with a couple of YN560-II speedlites. I already had a 430EXII. I wanted to know if I could shoot the 430EXII off camera at high speed sync using these triggers. I was only able to do it on camera without the triggers. As soon as I setup with the triggers, the fastest shutter I could use without seeing the curtain in the image was around 160 on my 5D2.