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Thread: ex430ii

  1. #1

    Default ex430ii

    recently bought a Canon ex430II.
    trying out rear sync with the control on the ex430ii.
    when set at rear sync at slow shutter, my flash fires 2 times; 1st when the shutter opens, 2nd when the shutter close.
    is it possible for the flash to fire once, only when the curtain close?

    thks.

  2. #2
    Moderator Octarine's Avatar
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    Default Re: ex430ii

    The first flash might be the ETTL preflash?
    http://www.photonotes.org/articles/eos-flash/#ettl

    Should not be visible with fast shutter speeds as the eye cannot resolve the two short flashes.

  3. #3

    Default Re: ex430ii

    i think its a pre-flash, Same goes for my SB-600 n 900 when the shutter is open for longer.
    D3s - (24-70 f/2.8)
    D700 - (14-24 f/2.8)

  4. #4
    Senior Member limwhow's Avatar
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    Default Re: ex430ii

    Quote Originally Posted by henghar View Post
    recently bought a Canon ex430II.
    trying out rear sync with the control on the ex430ii.
    when set at rear sync at slow shutter, my flash fires 2 times; 1st when the shutter opens, 2nd when the shutter close.
    is it possible for the flash to fire once, only when the curtain close?

    thks.
    It is indeed the pre-flash. Has to be so, if you set it to second curtain sync.
    Therefore I will always tell my subjects to expect two flashes and not to start running away after the first flash comes and goes.

  5. #5

    Default Re: ex430ii

    Quote Originally Posted by henghar View Post
    recently bought a Canon ex430II.
    trying out rear sync with the control on the ex430ii.
    when set at rear sync at slow shutter, my flash fires 2 times; 1st when the shutter opens, 2nd when the shutter close.
    is it possible for the flash to fire once, only when the curtain close?

    thks.
    yup its possible, just do a FEL with the * button on your cam, it'll fire the pre-flash and get the metering beforehand..

  6. #6

    Default Re: ex430ii

    understood, thks to all!

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