This guest post was made by Rolf Randby, the same person who wrote the Hot Shoe Adapter article. In fact, This slave trigger was the "trigger" (pan intended) for building the hot shoe adapter in the first place.
There are some Gazillion optical slaves out there. We even one optical slave unit published on this site. So what is so special about this circuitry? Rolf used a PIC (Programmable Interrupt Controller) to give this unit some very nice features: 1. No setup 2. It will work with a red eye setting in your camera. Yep, those annoying red-eye pre-flashes will not trigger the flash, it will "magically know" when the main slash if fired and activate the unit. 3. It will work with all point and shoot cameras.
Those three nice features accomplished with PIC hex code written by Evan Dudzik, from a algorithm by Rolf, make this unit an optimal optical slave unit for P&S cameras. It is the reason I call it the "Very Cool Optical Slave Unit". Rolf, for some reason, insists on the boring name "STF 1". I'll stick with my name - "Very Cool Optical Slave Unit" or VeCOSU :). Click to continue ›