I was directed to this thread by Yelvertoft when I mentioned using my 46 year old flash gun (Nissin 400HA) with my Canon 20Da. I have since measured the voltage across the flash output when charged up and found it to be 196 volts!!
Fortunately my camera seems to have survived but I feel extremely lucky as it is effectively irreplaceable. (the a version is no longer made and is impossible to get second hand)
Anyone tempted to try out an old flash unit MUST check out the reference given by Christine in the second post of this thread and if the model is not listed then measure the output yourself.
As Yelvertoft has advised me you can get a wireless remote trigger that can safely work the flash.
Dave
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