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Author Message   James Jones Rating: N/A Votes: 0 Posted on Wednesday, July 27, 2005 - 08:13 am:    Check the voltage at the foot of the flash when it is charged and ready to fire. The older 283's had a trigger voltage of 190-270 volts DC. The newer ones are in the range of 5-8 volts. If you have the higher voltage unit, do not use it on an electronic camera! See here: http://www.botzilla.com/photo/strobeVolts.html