Is it even possible? Hi, I am wanting my AB's to trigger at high shutter speeds. I have Yongnuo triggers 622NII and the 603N and I'm shooting with a D700. I can't get past ss of 160 with the 622's, from what I've been trying to research I think that's because of the camera? I tried to slave the AB with an on camera SB 600 but it wouldn't flash after ss of 320. Is there something that I already have that I can use or do I need to get something different? I did watch a video, he plugged an optical slave into the light but isn't that already built in to the AB? Please help! Thank you!