Film SLR Flash unit on a Digital SLR - Possible?

Discussion in 'Digital Cameras' started by alex, Jun 18, 2006.

  1. alex

    alex Guest

    Had an opportunity today to buy a second-hand flash unit that was TTL
    compatible with Canon EOS Film SLRs. I thought this would simply work on my
    350D and might be a bit of a bargain...

    The guy there said that it wouldn't work because the frequencies (??) were
    all different and that all photos would come out completely white...

    Is this true or not? I thought TTL was a standard (certainly on Canon
    compatible) and that if the Flash supported it and was compatible with the
    connector itself, all would work fine.

    Look forward to your responses, as this would be a good bargain if it did


    alex, Jun 18, 2006
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  2. alex

    alex Guest

    Bob, Thanks for the reply. I'm tempted, it was only £35 anyway so as long
    as there's no dangerous voltages or anything, would be a good starter flash
    and then as I need the extra functions I can upgrade to a 420/30EX with the
    bells & whilstles.


    alex, Jun 18, 2006
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  3. alex

    Helen Guest

    It's not frequencies that might cause problems. What you have to be careful
    about is the trigger voltage, which is the amount of voltage which passes
    through the camera when you release the shutter. Older flashes could sizzle
    the delicate circuitry of a modern DSLR, which require lower voltages. The
    350D can take a max of 6 volts. Google for "trigger voltage 350d" - that's
    what I did, then find out the trigger voltage for the flash unit you're
    looking at.
    Google is our friend, remember.
    Helen, Jun 18, 2006
    /\\BratMan/\\, Jun 18, 2006
  5. alex

    alex Guest


    Yes that sounds more sensible. Given what the some of the others say, I
    will be very weary of the voltages from now on. Thought they just relates
    to studio strobes etc, but didn't know flash units could produce them as

    Thanks alot, and thanks to the others in the chain.


    Alex C
    alex, Jun 19, 2006
  6. alex

    Eatmorepies Guest

    The flash I used with my EOS film camera works on my 350D but only at full
    output. However, with the histogram on your 350D you can see if you are
    calculating the correct exposures.

    Eatmorepies, Jun 19, 2006
  7. alex

    alex Guest

    OK went and had another look and decided to follow all your advice.

    Just ordered the 430EX Speedlite for £169.

    Does everything, very impressed with zero light AF beam - also ETTL allows
    Flash zoom and also detects /1.6 reduced frame on my 350D...

    One more Happy Photographer...

    Alex C
    alex, Jun 24, 2006
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