Nikon Pre Flash upsets Flash meter reading

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Cactus V6 11.  I have 3 units, one TX mode and two in RX mode firing Nikon SB 700 and SB 900.  The units are set to TTL and are controlable.  Problem is that when measuring flash power with Seckonic L-308 S in studio, the meter fails to record accurate readings.  Flash used without Cactus and in manual mode provides accurate meter readings.  I can only conclude that when used with the Cactus it fails to turn off pre flash thus giving spurious results

Is there any way or suggestions for turning off pre flash via the Cactus units?



  • Hi Peter,

    We responded here:

    As well as your email inquiry.

    L-858D from Sekonic is your answer. :)

    Antonio Lao
    Brand Manager

    To help us better help you, always state the exact firmware version installed on your Cactus device(s), such as: "1.1.013", "NIK.A.001", "v.103", or "A06".

    TTL or HSS not working on Cactus V6 II and V6 IIs? Be sure to check hot shoe connectivity by doing the <CAMERA INFO> check.

    Feel free to suggest an improvement or share product ideas. Contact us directly at  At Cactus, we listen. 
  • edited September 2017
    An alternative would be to use Cactus V6. These don't cause a pre-flash. You'd get remote power control for your flashes, but no remote zoom control and no HSS.
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