Canon EOS Flash Voltage

Discussion in 'Canon' started by Dick Campbell, Nov 7, 2003.

  1. I was surprised to learn that some external flash unit can damage the
    electronics in Canon EOS cameras. The story goes that Canon recommends that
    the voltage seen at the hot shoe should not exceed 6V DC.

    I have been using a Hanimex TZ*2 which I have since measured at 250V, just a
    bit higher than 6V. This confirms the figure quoted on this web site Nothing seems to have gone
    wrong but I am not keen to continue using it if the story is really true.

    I haven't seen anything about this from Canon and there are no warnings the
    300D manual as far a I can see.

    Is this just some kind of misunderstanding? The only was to measure the
    voltage is to allow the flash unit to charge up separately from the camera
    and measure the open circuit voltage. The voltage could be quite different
    when connected to the hot shoe, depending on the internal resistances of the
    flash and camera circuits.

    Dick Campbell
    Dick Campbell, Nov 7, 2003
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