So, the SU-800 sitting on top of a camera sends IR signals to the remote flashes, such as SB-800, SB-600. My question is: do those remote flashes still emit pre-flashes, so that the SU-800 can measure their contribution and adjust their output, just as would happen if a Commander/Master flash was sitting on top of the camera instead? The reason I ask is twofold: 1. I have heard mention (by Uncle Frank amongst others) that one of the benefit of the SU-800 is to eliminate pre-flashes, but I am afraid that this only applies to the on-camera flash (replaced by the SU-800) 2. If indeed, there is no pre-flashes emitted by the remotes, they can in turn be used to trigger optically any other flashes. While they won't be part of the CLS magic, they could be set manually and trigger at the right time, not being confused by the pre-flash sequence ... or, am I only dreaming? Thanks!