Anybody have a Vivitar Zoom Thyristor 3500 flash with DM/C module?

Discussion in 'Digital Cameras' started by Peabody, Apr 5, 2011.

  1. Peabody

    Peabody Guest

    I was given one of these today, but can't find a manual anywhere.
    This doesn't look promising for off-camera flash because in Manual
    mode there is no power adjustment. But as an automatic thyristor
    flash, it might actually work on-camera as a poor man's TTL.

    First things: I measured the voltage between the center contact
    and the shoe shell contact, and it's 9.5V on my R/S meter, which
    reads a bit high. So probably 9V. Does that sound safe for a Canon

    I assume the "DM/C" module means it fit FD, or whatever the Canon
    film camera flash standard was in the early '80s. It has two
    contacts in addition to the center contact. So I assume the XT
    would treat it like a manual flash.

    The flash has three manual zoom settings - W, N, and T. But there
    are two other settings. One sets the ASA (25 to 800), and the
    other selects between M(anual) and one of three colored dots -
    orange, green and red. I believe the dots are related to the
    thyristor function, but I don't know in what way.

    Also there's a green LED that lights up for a second when I trigger
    the flash in any of the dot settings, but not in M mode. I'm not
    sure what the LED indicates.

    Well, if anyone has any explanations, or a link to the manual, or
    warnings, please post a response. Thanks very much.
    Peabody, Apr 5, 2011
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  2. Peabody

    Bruce Guest

    A Google search on "Vivitar Zoom Thyristor 3500" yielded 12,800 hits
    including some discussions that look likely to be of help.

    As a general rule, it is worth searching on Google before you ask
    people for advice on here, because it is quite possible that your
    questions have already been answered.
    Bruce, Apr 6, 2011
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  3. Peabody

    Bruce Guest

    Bruce, Apr 6, 2011
  4. Peabody

    190836 Guest

    By chance I was looking up the 3500!

    I am getting rid of items for a relative who has gone abroad. Amongs
    them is
    a Vivitar Zoom Thrystor 3500 flash with a small integral unit at th
    base that pulls away. I doubt seeing that the manual was printed in Jun
    1982, I doubt the unit has any value. Perhaps someone can confirm.

    If that assumption is correct may be I can get the manual to yo
    physically or scanning the English pages to a pd
    190836, Jul 19, 2011
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