Just wondering if any of you have had success achieving max flash sync speed (f8 1/4000) with off camera flash? Seems the most I was able to achieve was at f4 @ 1/2000. Any combination faster just gives mainly a dark image no matter how high I put the flash power. I was testing using my Cybersyncs with a Nikon sb20, sb900 and even a fuji Ef-20. I have yet to test with my alienbee b800 unit.