Flash for RebelXT D

Discussion in 'Digital Cameras' started by Robert M. Mazo, Mar 24, 2005.

  1. I have a Sunpack 433AF for Canon flash that I have been using for some
    years with a Rebel XS film camera. I recently bought a Rebel XT D
    digital (which, incidentally, I like very much). The XT does not
    recognize that the flash is attached when I insert it into the hot
    shoe. I checked that (a) the flash still works perfectly on the film
    camera and (b) a Canon flash marketed specifically as an accessory to
    its digital line works perfectly on the XT, so it is not a defective
    part causing the XT problem.

    A camera store salesman told me that it is a design problem. The film
    and digital Rebels have different voltages on the main hot shoe pin.
    Can anyone verify this?

    Can you suggest a way, short of buying a new flash (I can think of
    that myself), of mating the 433AF and the XT D?

    Thanks, Bob
    Robert M. Mazo, Mar 24, 2005
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  2. Robert M. Mazo

    Eric Gill Guest

    Yes. Furthermore, you can burn the digitals with overvoltage from older
    flashguns. You *really* need to be cautious when hooking old equipment to
    new bodies, and make sure they use no more than about 6 volts.
    Not until you can establish what sort of juice it's going to put through
    the hot shoe, no.
    Eric Gill, Mar 24, 2005
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  3. Robert M. Mazo

    Mark B. Guest

    Even if you use a device such as a Wein Safe Sync to regulate the voltage
    down under 5 volts, I'm pretty sure this Sunpak is dedicated for Canon TTL
    only. Canon digital needs E-TTL for through the lens automatic flash;
    that's why the older Canon EZ flashes won't do auto flash on their digital
    bodies. So it has more to do with the exposure system than the voltage.

    Metz & Sigma both make E-TTL flashes. The Sigma EF-500 Super DG gets
    consistently good comments from users. I have the non-DG version and use it
    without major problems on a 10D.

    You can use a flash that has an independent thyristor such as the 383 Super.
    I used one briefly on a Canon G1 before getting the 420EX; if I recall, the
    voltage on the 383 was under 6 volts but the exposures with the 420EX were
    much better.

    Mark B., Mar 25, 2005
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