Slave Flash Technique CA70,75,85 Power Shot

Discussion in 'Digital Cameras' started by Vernon Kuehn, Jan 31, 2005.

  1. Vernon Kuehn

    Vernon Kuehn Guest

    O.K. I should have save up a few more pennies and purchased a digital with
    an external flash connector.

    My A70 built in flash does not quite do some of the group shots I want to
    do. My efforts to add a flash with a synch trigger are less than hoped for.
    Is there a setting, a trick I am missing? The internal sensor seems to over
    react to the extra light and I get a darker picture with the extra flash
    rather than a brighter, lighter picture.

    I searched the web, check magazines at the news stand, and browsed books at
    the store and the library. There is no literature other than "You can use a
    slave flash if you need more light." Not!
    Vernon Kuehn, Jan 31, 2005
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  2. Vernon Kuehn

    Era Guest

    I have experinment with a slave on my A95. Been there and done what U

    You need to set your setting to Manual. There is a "delay" with the
    camera sensor setting (something like that!)
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    Era, Jan 31, 2005
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  3. Vernon Kuehn

    Ronald Hands Guest

    Canon A series cameras use a pre-flash to calculate exposure. It
    fires only milliseconds before the main flash but it's often strong
    enough to trigger the slave on your main flash. Result: you see the
    main (slave) flash go off; you think it's illuminating the picture; it
    isn't. It has fired and extinguished before your camera actually takes
    the picture.
    Try shooting in manual mode, where there's probably no pre-flash (at
    least there isn't on my A75). I'm getting excellent results in manual
    mode, at 1/125th and whatever aperture my flash meter indicates, with a
    White Lightning 10,000 bouncing into an umbrella. If you don't have a
    meter, just take some test shots at various apertures. You must, of
    course, use the on-camera flash to trigger the slave but I find I can
    turn it back to 1/3 power which means it has virtually no effect on the
    final picture.

    -- Ron
    Ronald Hands, Jan 31, 2005
  4. Vernon Kuehn

    tomcas Guest

    As I understand it you need a special slave that has a setting to ignore
    the preflash, like the Phoenix D91
    or the DSF-1s DigiSlave Flash
    tomcas, Feb 1, 2005
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