>Russ, >How would you shoot fast paced action when you may not have >time to FV lock w TTL?
When I shot reception dancing, I always used regular TTL, with the flash set at -1.0 to -1.7 ev, since dancing has so much dark area that the flash will usually overexpose if you leave it at 0.0 ev. You can't use FV Lock on dancing, because there is no time for it. I just made sure the focus was right and placed the subject in the center. I would crop the images later for proper subject placement.
Also, I always shot raw for dancing, so there would be more room for exposure adjustment later.
I never used TTL-BL, because it underexposes unless you boost the ISO a lot, which makes noisy images. Also, TTL-BL in camera A mode always selects 1/60th sec, and this ends up with way too much ghosting in the faster dancing shots. I like 1/125th to 1/160th for fast dancing. That will give you just a bit of ghosting to convey the motion.