Canon E-TTL Metering and Optical Studio Slaves

Discussion in 'Canon' started by Russell, May 23, 2005.

  1. Russell

    Russell Guest


    If you are using studio lights that are triggered by optical slave units,
    does this
    mean that the flashes will be triggered too soon by Canon's E-TTL Metering?

    The reason I ask is because with the E-TTL metering, the camera sends out
    two flashes, one for the metering, and a second one straight afterwards for
    the actual photo. Does this mean that the first 'metering flash' will
    trigger the flash units? If so, is there a way round it as I can't find a
    way to turn it off?
    Russell, May 23, 2005
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  2. Russell

    Alan Guest

    Don't use a Canon flash at all - just connect the studio flash(s) using the
    flash socket on the camera, or by a hotshoe adaptor.
    Alan, May 24, 2005
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  3. Russell

    Alan Browne Guest

    1) Can you set you flash to manual so it only sends out the exposure
    flash? (What I do (Minolta system) is put on an accessory flash and
    set it to Manual at 1/16 or 1/32 power. In this mode only one sync'd
    flash goes out).

    2) You can get slave devices from Wein that will 'skip' the first flash
    and trigger the lights on the second flash pulse. Just plug this slave
    in the PC sync socket of the strobe and disable the strobes own slave

    3) Connect a PC sync cabel to the camera's PC sync or hotshoe (may need
    an adaptor) and fire the flash that way.

    Alan Browne, May 24, 2005
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