Just to let you know, I am only a beginner in flash photography, and DSLR photography as well in fact, and am interested in buying a YN-560 III flash, and a pair of RF-603s.
I would like to be able to use the flash for high speed photography, like water drops, and water balloons popping etc. This would mean off camera.
From what I've read, rather than trigger the shutter, as there is too much lag etc, it is best to capture such shots in a dark room, with a 2 second or so shutter duration, and fire the flash at low power (and thus speed) to freeze the motion.
What I plan on doing, is buying (or making) an acoustic trigger, that triggers the flash, based on a sound, like the pop of a balloon. What I'm trying to work out, before I go ahead and buy the flash and triggers, is whether or not the RF-603 can trigger the flash remotely, if I plug a PC sync cable from the acoustic trigger into the RF-603. If not, is there any way, ANY way that I can trigger either the RF-603 (or the flash itself) from the output of the acoustic trigger?
Perhaps by having a hotshoe cord from the acoustic trigger?? That the RF-603 sits in, and takes its input from?
I really appreciate your time everybody, I hope I can make these pieces of equipment work, and start making some high speed shots!