I want to do some high speed photography so I'm going to need some type of trigger to fire the flash (which I'll have to buy I suspect), the camera and the event at the same time. I've no idea how to go about it. Perhaps something that would work by sound? Say I smashed a glass and I wanted it to record the second in starts to crack. Is there any way to make my own trigger? The only camera that I've got to work with is my Dynax 5. It's the only camera I have that uses an electronic shutter release. I made my own one so that side of things is ok. But getting it all to work on a sound is where I'm going to struggle. I have no knowledge of things like that.