Apologies for this question -- I know there's tons of discussion on the acceptable voltage on a Nikon D50 hotshoe (250V), and the trigger voltage from a Vivitar 283 (varies, depending on build year, location). I've tested the trigger voltage with an analog meter, and it hovers right below 250V. However, this 283 is practically brand new (discovered it in a box while moving, and I'm sure it's only had 4 or 5 flashes ever), and the Wein SafeSync option is _expensive_ enough to warrant putting that $$ toward a new flash anyway. The shoe on the flash actually comes off with two small screws, and the wires into the flash circuitry are right there. So I got to thinking... can't I just solder a Zener diode across the terminals to prevent anything more than, say, 6 volts, from crossing over into the camera hotshoe? So on my way home one day, I picked up a pair of 5.1V Zeners from RatShack. On the drive from RatShack to the house, I wondered something else, though... will the Zener diode across those terminals prevent the charging circuit from ever going above the 5.1V rating of the diode? My EE skills are a bit rusty, but the flash is free, and at $1.29 for two Zener diodes, I'm willing to play with it a bit. Has anyone built a circuit internal to the Vivitar 28x flash to keep the trigger voltage below the 12V ISO standard? If so, any pointers to a diagram? Failing that, anyone want to trade for a pristine Vivitar 283 (made in Japan)?